You can! Students can log into the library with their AMU/APU campus username and password, so you can provide links to pages on the library website (https://www.apus.edu/apus-library/) via email, announcements, assignments, etc.
We do encourage you to explain the library's website navigation to your students, in addition to providing direct links. This way, if they lose track of the link you gave them, they will still be able to find the resources they need from the library's homepage.