How to change app theme or app icon in locksmith app?

here's locksmith widget and if you tap on three dots in top left you can change app Theme but you need to have at least three friends to change it when you have three Partners you will be able to change your app icon so how you can do that you don't need to upgrade because if you want to change picture design then you need to actually to upgrade and become a diamond member for 14 4.99 per week um so that's what it is but uh that's yeah so that's the process