Applying an Activation Code on Skritter Classroom Use Skritter Classroom to apply a coupon code to new members or add additional time to students who already have Skritter accounts! 1 Go to Manage Members under Tools. 2 Select the members you wish to apply to code to. 3 Enter code where it says "Enter Coupon Code" and hit the Apply Coupon button. Expires time will be automatically updated.