How can i change the theme logo or background or music of my game?

On Android Device to change logo or background or music, open the game preview screen.

 Step 1: Open the game details / game preview screen.

Step 2: Click / Tap on the setting below preview screen.

Step 3:   In Custom Theme Settings Click / Tap on the trash button. 

Step 4 : Now you can see a browser or “+” button and it will open a dialogue to choose an image / audio which you want to use.

Step 5: Hit on save button