I want to add a new Game. It's called "Undertale: Help from the void" or short "Help from the void"

Assuming that’s a fan game, it would go here.

https://www.speedrun.com/series/utdtfg/forums/hklt2

Yes, it’s definitely possible to add a new game! Just head over to the “Game Requests” section on the forums and follow the submission guidelines. Make sure the game isn’t already listed and provide all required details. The mod team usually reviews requests pretty quickly. Good luck!