My mouse is a little broke, and since I am too, I'm stuck with this one. M3 doesn’t work, and I've been wondering whether it's possible to re-map that key, and if so, how?

Furthermore, I've read that 'H + [ENTER]' should auto-solve the hint, but it doesn't for me. Is this one on me, or is the information just outdated/inaccurate? :3