The 1.58 update fundamentally changed how trainers are used by nerfing core survival mechanics: Healer Nerf:
While there isn't a single official "guide" for a version 1.58 trainer, the most common and reliable method to use cheats for Battle Realms: Zen Edition (v1.58 and later) is through the WeMod Trainer platform Battle Realms Zen Edition Trainer 1.58
Tools to instantly repair hovered friendly buildings or damage hovered enemy structures. Where to Find & How to Use Battle Realms Zen Edition Trainer 1.58