This is not a stand alone application. Themes require Kustom Live Wallpaper PRO (Not the free version of KLWP).

Kustom (KLWP PRO) https://play.google.com/store/apps/details?id=org.kustom.wallpaper.pro

What do you need:

✔ Kustom (KLWP PRO)
✔ A KLWP compatible launcher (NOVA LAUNCHER RECOMMENDED)
✔ Hide Status Bar

Open the KLWP then go to the global tab Where you can change Your Walls, Colors and most of the stuff.

If you liked the MELOD UI KLWP, do not forget to rate the stars and leave your comment!
Please contact me with any questions / issues before leaving a negative rating.

My Twitter:
https://twitter.com/designsmelodic

All These Themes Were Made With a One Plus 7 Pro Device.