If using Desktop, click HERE.
If using Mobile Web (Not the App), click HERE.
Click "View My Profile".
By default, your friends will be viewed as a list.
To view more of your friends, scroll to the bottom and click "Next".
You can also view all of your friends on a map by clicking the "Map" icon.
Click on any of your Friends' pins on the map to bring up their Username and current Check-in information.
Click on their Username to view that Member's Profile.
Click "Message" to send a private message, or "Remove Friend" to delete them from your friend list.
Now that you know what the Friends section does, head over to the site and give it a try by clicking HERE.