If you don't see it, you may need to click to add it from your emote list to a free slot.

If you decide to proceed with using a trainer for personal testing or casual play, following strict security protocols is vital to protecting your computer and your personal data. 1. Source from Reputable Providers

However, . Important data like your character’s level, inventory, gold, and health are stored on Blizzard’s servers, not your computer. If a trainer tries to change your gold from 1,000 to 1,000,000, the server will check its own records, see the discrepancy, and immediately revert the change—or flag your account for cheating. The Risks of Using a Trainer

Prevents your character's life pool from dropping, making death impossible even against world bosses.