Actually, the only things you have to do is to create file exclusions for the trainer exe file and the tmp file called - ~CheathappensTrainer.tmp - (located in the Windows tmp folder -> C:\Users\YourWindowsUserName\AppData\Local\Temp\).
Maybe you like to have a look on how to do it -> Link
Every trainer comes with a readme file or has instructions embedded in the user interface. This trainer here comes with a PDF file.
You need to be in the actual gameplay where you can run around and such. ALT+TAB out to Desktop and open the editor with the button down below - Open Editor
You can enlarge the trainer to see all of the options listed there and their values. Change a value and tick the box in front of the designated option to make this new value stick if you like to.