Quick answer:
Open Year Groups in the left menu to find your mentor group. Your Homeroom Advisor also shows on the right of your Portfolio.
For students: find which mentor group you are in and who your mentor is.
Find your mentor group
Select Year Groups in the left menu.
Open your mentor group.
Find your mentor's details
Open your Portfolio.
Look for your Homeroom Advisor in the details on the right. Your school may call this role Mentor.
📝 Note
Some resources, such as a library catalogue, are run by your school. Ask your teacher or librarian about these.