When this option is enabled, new users must complete two verification steps. First, they must confirm their email address by clicking a link in the confirmation email. Second, the site administrator must manually review and approve the registration request. Only after both steps are completed can the user fully access the site.
To enable this option, go to the Form Editor from User Registration > All Forms > Edit.

- Go to Form Settings > General > User Approval and Login Options.
- Choose the ‘Admin approval after email confirmation‘ option from the available dropdown menu.

- Click on the Update form.
Now, when the user registers via this form, they will first confirm the registration via the link sent to their email. Then, the admin will have to approve the user.