You likely have the wrong version. The v1.5 editor works with Cemu 1.22.x. The v2.0 editor works with Cemu 2.0+. Update your emulator or editor.

Before proceeding, be aware that using a memory editor can potentially harm your game save or console. Use at your own risk.

Editing memory on physical hardware is significantly more difficult.

Lock health and stamina to prevent them from decreasing, or set weapons and shields to be unbreakable.