My admin created and populated all my students ( high school ) into my account (teacher) and I have no idea how to give them their passwords since they do not have email address.
If your students do not have email addresses or their email addresses are not entered in Canvas the Canvas admin at your school or institution would have to assign them passwords as part of the account creation process, so you will need to check with your admin on how your students are supposed to obtain their passwords.
The only other thing that I can think of is if you have a Single Sign On (SSO) option turned on with Canvas. If that's the case, your students wouldn't see the Canvas login screen they would go to a login portal that your school uses and that would manage their logins. But either way, you local Canvas admin should know the answer and be able to help you.
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