Teachers can make assignments for their students to complete on the web site. To do this, they must have classes set up in BrainPOP. Classes can easily be synced from Google Classroom in one quick click.
Follow these instructions to import your Google Classroom to BrainPOP:
When you go to your Dashboard, if it does not give you the pop up "Would you like to import your classes?" choose "Import your classes" and then import the "Mrs. MyTeacherNames Grade 2019-20" class (or whatever your current classroom name is).
If this is done successfully, you should see a class with the same created and all of your students inside it.
Watch this video for a demonstration of setting up assignments (I recommend skipping about 25 minutes in):