You might need to click the blue SSO sign-in bar and if that doesn't work, sign-in again using same credentials.
Use search options in the upper right corner and narrow search format to ebooks only. This will bring up over 200 book options for you. Click the open button to read. If it is a MackinVia book it will redirect you to that site and use the directions below.
This ebook library is accessible through your SSO Portal. Choose Clever and then Sora. There are more recent book selections here and some graphic novels.
The username for MackinVia is same as the SSO and the password is your lunch number.
If you don't like video how-tos, linked here are written directions.