Read the Directions Pwizard posted.
I did but for some reason on my machine I have to launch the game with bf4_x86.exe in stead of the BattleLOG Web Launcher play campaign button to get the trainer to work.So I am going to keep doing it this way on my machine since everything works great for me.
it may be that the bf4_x86.exe launches the bf4.exe automatically on 64 bit OS machines if you are using the non-origin legit release.
best,
Cal