----Updated------ Found out how to do it.

For future reference. Go to

Admin Panel---> Global Configuration--->Additional Settings
Uncheck this 
Members with email_verified = 'no' are allowed to access the site
Members with email_verified = 'undefined' are allowed to access the site

----Updated------ Found out how to do it.

I remember seeing it somewhere in the admin panel. But i cant seem to find it anymore.

Its where when i user joins they have to click a link from their email to active their account