Enter text that you want shown by typing the message the way you normally would.
Use the " // " operator
Add // to separate displayed text from hidden text. Any text entered after // will be discreetly hidden.
Send the message
Once the message is sent, only text entered before // will be displayed on the screen. Text entered after will be displayed only when the recipient presses on the message. Check to make sure you used the operator correctly.
Display the hidden message
Upon receiving the message, the recipient has the choice to view the message when desired by pressing on the displayed message to pop the hidden message onto the screen.
Now you can control when a message is displayed on your screen using Apple's 3D Touch. Private messaging done right.