Requirements:

• Official LG ROM (or ROMS based on it)
• QuickMemo installed and working properly
• Not compatible with Quick Circle case

To use Key Plus, you must first make sure it is the default app for Volume Up and Down buttons, while the phone is locked. Here is how you do it.

• Lock your phone
• LG G4
  • Press Volume Up button two times
• LG G3, G2, G Pro and others
  • Press and hold the Volume Up button until you feel a vibration
  • Release the Volume Up button and unlock your phone
• You will see the screen below. Select Key Plus, make sure "Use as default app" is ticked and click OK.
• Repeat from Step 1 for Volume Down button as well
• Done!