Clever is a service that has your learning apps in one place. To access Clever:
Open Google Chrome on your Chromebook
In the upper-left corner of Chrome, you will see "RCS", click it, then select CLEVER
Once Clever is open, click the button that says "Log in with your Google username and password"
Next, a window will appear asking you to click your school-issued Google account, click it
Once logged into Clever, click on any of the app icons to use them (for most of the apps listed you can click the "Sign on with Google" button to log into them). For other apps, you will automatically be signed into them.