Hi destiney zayas Welcome to the Canvas Community!
Access and login credentials are different for almost every school, and you have asked this question in a global community of Canvas users who can only access their own accounts and courses.
Typically, you would use a web browser like Firefox or Chrome to navigate to your school's Canvas site which likely has a URL resembling https://YOURSCHOOL.instructure.com (substitute your school's name in that example), but there are even variations on that, and you would also still need to know your login credentials.
Really, your best bet is to contact your school directly, and ask someone.
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