I am new to canvas and don't know if there are other ways to access the submit button when it isn't shown in the top right corner when opening the assignment.
If the Submit Assignment button is missing, it is possible your teacher has configured the assignment to not have any submission (and this is a possibility in Canvas).
If you are expecting there should be a submit button, I would recommend you reach out to your teacher directly. You can follow this guide to send them a message How do I send a message to a user in a course in Conversations as a student?.
They can double check to ensure everything is set up OK, or provide extra guidance if needed. If your teacher lets you know it is definitely set up all OK, please reach out to us again and we will see what we can do to help!
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