Okay simple, First off to run a hack you need a menu (recommending buying one) and you would execute it by either injecting or execution. Now you need a bypass so you won't be detected by battle-eye's security system. In the free menu if that is what you picked you have to make sure that the scripts inside it aren't old and detected. This will result in a ban, and one more thing. Buy keys from a seller to provide your wide range of using hacks in dayz.
Main options to execute the menu in-game would be either Scroll-Lock, Insert, F1. Depending what you have, you will have to find out yourself. And one more tip, try not to completely go reckless and stuff up someones server and don't use your main key off steam. Thank you for reading.
Sincerely Tareq.