Hello,
Unfortunately, we can't help you here as this is a general Canvas forum, and we do not know your institution (School/University?), nor do we have access to make any fixes to it if necessary.
If you cannot find a link to Canvas (or another online class management system) in your institution, you may try searching for "Canvas" and your institution name on a search engine of your choice, and then logging in to that (if the URL seems legitimate - for example, as either [universtity].instructure.com, or canvas.[university].edu).
Alternatively, if you still need help, you should contact your instructor and/or your institution's IT/Canvas support.