You can add friends in multiple ways:
1. Via the Home Page: Within your lists of Matches, New, and Recently Viewed, you can add friends simply by clicking the "Add Friend" button next to each user.
2. Within a User's Profile: Within a specific user's profile, you can add him/her as a friend simply by clicking the "Add Friend" button within their profile.
Note: The user will need to accept your Friend Request in order for you to be able to unlock Friendship privileges with that user.