Good morning, @Wenji ...
While the vast majority of folks here in the Community wouldn't be able to answer specific questions about your assignment (those should be directed towards your instructor because we do not have access to your course or your school's Canvas environment), we can give you some general guidance. For starters, I would recommend that you watch these two short video tutorials...which should hopefully help you with submitting the assignment to your instructor:
Then, if you want to take a deeper dive into assignment submissions, there are a lot of written Guides that are available, too.
I hope these resources will be helpful to you. Sing out if you have any other related questions...thanks! Take care...be well.
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