This article explains how to manually verify an email address for a user.
Please Note: This option is only available to accounts with administrative permissions.
HOW TO VERIFY A USER'S EMAIL ADDRESS
Select "Edit a User" from the admin menu.
Search for the user you would like to verify the email address for. Click the next button.
You'll see various information to edit. Under the username field you will see an option to verify the email address. (See red arrow in image below.) Check this box, then click the next button.
Progress through the "Edit a User" process as you see fit. When ready, click the finish button.