Locket only works if you add friends!
To send a friend request:
Open the Friends page by using the "Friends" button on the top of the app.
Make sure your contacts are enabled.
Then, search for a friend and click the "add" button
You have just sent a friend request on Locket!
To accept a friend request:
Open the Friends page by using the "Friends" button on the top of the app.
Click on "Accept"
You are now friends on Locket!