my canvas wont allow me to upload my assignment or even open the assignment tab
Welcome to the Canvas Community!!!
Is the assignment that you are trying to upload to set up to receive files uploads? Does it have the Upload File option? If so, what browser are you using? It is recommend to use Chrome or Firefox.
If it does not have the Upload File option, then the assignment is not set up to allow for online submissions with a file upload. In that case, I would recommend contacting your instructor.
Here are some troubleshooting steps:
Retrieving data ...