Whenever Apple makes changes to their terms of service, these will need an action from all account holders. We will then ask you to log in to your account and do the following changes.
Log in to your App Store account
You'll see a yellow banner explaining what to accept, generally that banner contains a link on where to go.
On the destination page, click on "View and Agree to Terms":
On the popup page, scroll the terms down completely, check the box and press agree: