You can register BCS by following the steps below:

→Click "Registration" in the main menu.

→On the new window, click on the "Create You Profile" tab.

→Please fill out the form and click the "submit" button. 
Once your profile has been created successfully,
you would be allowed to select classes.

→Click on the "Select Class" tab.

→Select your class by checking the box next to it.

→once ALL your classes are selected, click the "submit" button.
A message will pop-up which shows the summary of the classes selected.

→Click "pay here" to pay online or apy at school.