@tm3077
Welcome to the Canvas Community! Typically a blue Submit Assignment button displays at the upper right of the screen as depicted in the Submit Assignment section of https://community.canvaslms.com/docs/DOC-9539-421241972 I can't explain why one of your courses directs you to look for a red button at the bottom; perhaps the instructor copied and pasted those instructions from a different system, or perhaps you're being directed to an external tool for that assignment.
It's also possible that some of your assignments don't require a submission, in which case there would be no Submit Assignment button displayed for those.
If you are still not able to locate the button to submit the assignment, please use the help resources provided in your school's help menu to get direct assistance from someone who can look at your account, your courses, and your device and browser.
Good luck!
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.