Taken from Softmod Depot’s Forums. Original Tutorial is located here

Adding & Using EvoX Trainers

(1) Get some  .ETM  files
(2) FTP to your xbox
(3) Go to C:\Trainers or if your Xbox is softmodded go to E:\Dashboard
(4) Transfer your new .etm files into the trainers folder
(5) Use the EvoX dashboard and select the “Trainers” option
(6) Select the trainer, then choose the cheats
(7) /\fter confirming put the game in the DVD rom or choose it off the hard drive
( Play.

also some trainers are .Xbe files
to make these trainers work you must:
(1) Manually choose the .Xbe – this means using file explorer and going to  C:/Trainers  and clicking on the .Xbe
(2) Once you click on the .Xbe file it will give you a cheat menu, select your cheats.
(3) Follow the instructions on playing the game off the HDD or DVD and select your type.
(4) Play.

NOTE:
Some trainers have “IGK” ( In Game Key )
IGK means you can turn on or off the trainer while you’re playing
Every game has a different IGK, in the cheat menu it will tell you the IGK

——————–

Tutorial by: B00ST