Easy You should be able to follow along easily if you are able to find blocks by looking at a screenshot.
The AdMob Rewarded Video component is specific to AppyBuilder. This video will help you create an AdUnitID using Google AdMob and copy/paste that AdUnitID into the RewardedVideo Component property window within AppyBuilder. Setting up an account with AdMob will allow you to make real money from the apps you create with AppyBuilder!
YouTube Tutorial Video: