How do I redeem my redENGINE key?

Go to https://redengine.eu/signup and create an account. Then go to the Client Area and redeem your key in the Redeem tab.

How do I use redENGINE?

Download the loader from their website and enter your credentials. Then open FiveM to the main menu and click Launch in the launcher.

How do I open redENGINE once it has been injected?

Press the Insert key on your keyboard. A menu should pop up for you to begin using redENGINE.