My instructor gave an assignment that requires that the answer be submitted in a text box. The page shows only the text of the assignments and the instructions to submit the text of the response to the assignment in a text box. This is the desktop version of Canvas. It is the new version of courseworks. There are no links on the page to click. There are no buttons to press. How can I submit my assignment in a text box?
Hello Yakov Epstein 
First, I'm making a huge assumption here...so please bear with me if this is completely inaccurate. Based on your e-mail address here in the Community, I am unable to determine which school you are attending. But (and here is where the assumption comes in...which may be completely wrong), when I did a Google search for the words "courseworks" and "Canvas", I got multiple listings for Columbia University in New York. So, with this bit of investigation, it seems that Columbia University has branded their Canvas environment as "CourseWorks" (CourseWorks | Columbia University Information Technology and CourseWorks Support | Columbia CTL).
But, that doesn't address the issue you've come here to ask. After reading through your question, the first thing that came to mind was that your instructor may not have configured all the settings properly for that particular assignment. It is quite possible that your instructor has inadvertently forgotten to choose the submission type which allows you and your classmates to actually submit the assignment to your instructor. Here is a link to an instructor Guide that he/she would use to create an online assignment: How do I create an online assignment? As you can see, your instructor would need to choose the "Online" option and then further use the check boxes to select various ways in which the assignment can be submitted. After your instructor saves these changes, then you should see a button at the top of the assignment that allows you to submit to your instructor. If that button doesn't currently exist (as you've indicated), then your instructor may have that option set to "No Submission" by mistake. You cannot change any of these settings since you're a student, but you may want to provide your instructor with a link to the Guide I provided to let him/her know there might be a problem. You can contact your instructor by visiting your "Help" menu within Canvas. How do I get help with Canvas as a student?
I hope this information will be of help to you, Yakov. Please let the Community know if you have any additional questions about this. Thanks!
Hello Yakov Epstein
Welcome to the Canvas Community. Thanks for posting your question.
First, I'm making a huge assumption here...so please bear with me if this is completely inaccurate. Based on your e-mail address here in the Community, I am unable to determine which school you are attending. But (and here is where the assumption comes in...which may be completely wrong), when I did a Google search for the words "courseworks" and "Canvas", I got multiple listings for Columbia University in New York. So, with this bit of investigation, it seems that Columbia University has branded their Canvas environment as "CourseWorks" (CourseWorks | Columbia University Information Technology and CourseWorks Support | Columbia CTL).
But, that doesn't address the issue you've come here to ask. After reading through your question, the first thing that came to mind was that your instructor may not have configured all the settings properly for that particular assignment. It is quite possible that your instructor has inadvertently forgotten to choose the submission type which allows you and your classmates to actually submit the assignment to your instructor. Here is a link to an instructor Guide that he/she would use to create an online assignment: How do I create an online assignment? As you can see, your instructor would need to choose the "Online" option and then further use the check boxes to select various ways in which the assignment can be submitted. After your instructor saves these changes, then you should see a button at the top of the assignment that allows you to submit to your instructor. If that button doesn't currently exist (as you've indicated), then your instructor may have that option set to "No Submission" by mistake. You cannot change any of these settings since you're a student, but you may want to provide your instructor with a link to the Guide I provided to let him/her know there might be a problem. You can contact your instructor by visiting your "Help" menu within Canvas. How do I get help with Canvas as a student?
I hope this information will be of help to you, Yakov. Please let the Community know if you have any additional questions about this. Thanks!