To use Locket, the first step is to add the widget to your home screen!
iPhone & iPad
From your Home Screen, touch and hold a widget or empty area until the apps jiggle.
Tap Edit in the upper-left corner.
Tap Add Widget.
Search for "Locket", then tap on it.
Select a widget size, then tap Add Widget.
You're done!
Android
From your Home Screen, touch and hold on an empty space.
Tap Widgets.
Search for "Locket", tap on the widget, then tap Add.
You're done!