Registration - How Do I Set Up Email Confirmation Link?

My website uses Simple Membership plugin for Registration with BuddyPress Profiles. Currently, when someone registers for a free membership they are not required to confirm via email link. I believe this is causing a problem with GMail and a few others who think I'm sending spam.

Can you tell me how to require an email confirmation link when someone registers at https://christiangays.com/choose-membership-level/registration-form/

Thanks!
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