Pie Register gives you multiple ways to verify new users.

To set this up in the sidebar go to Pie Register and then click general settings, scroll down to the Youtube verification area and here decide which type of verification you’d like to use. Email and Admin verification is only available on Pie Register Pro so let’s say that we want just Email Verification. You can set a grace period if the user does not verify or if you choose admin verification if the admin does not verify within the grace period the user will be automatically be deleted. With a grace period of 0 days, the user or admin will have unlimited time to verify the account. Once you’re happy with the way. Scroll down and click Save.