Step 1.

You must be either be  logged into a Chromebook OR logged into your school e-mail account through a web browser such as Chrome or Safari.

Step 2.  Find your app drawer.

Step 4.  Select 'More' and find 'Brain Pop'

Step 5. When Brain Pop opens in a new window, find and choose the picture that says 'Brain Pop Jr.'  That is it!  No sign in required. You will already be signed in.