Hello @elboufatimaezza 
Welcome to the Canvas Community. Thank you for posting your question. If you are an instructor, you will need to "publish" your course to make it visible to your students. How do I publish a course? You may also need to go into your course "Settings" to ensure that your start/end dates are set correctly and that any restrictions are also configured (whether or not your students can get access before/after the course start/end dates). Here are a couple more Guides for you: How do I change the start and end dates for a course? and https://community.canvaslms.com/docs/DOC-12717-4152332400 I hope these resources will be of help to you. Sing out if you have any other questions about this...thanks!
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