It will help when posting a request that you include "ALL" revelant model information (which your current post lacks.)
it should have included the model line: Pavilion see example below
HP Pavilion 24-r029na All-in-One Desktop PC
since this model is a all in One Touch Screen capable unit, it really is not intended for wall mounting and as such does not have a premade wall mount kit.
you can however adapted a vesa wall mount kit by making a custom adapter plate that adapts the HP 24-r029na mounting screw locations to a standard vesa screw mounting