To start, you hate installed both the hunger/thirst script AND the HUD script, right? If so, go into the HUD script, and check the configuration part. There should be a part that specifies which switch controls the HUD being displayed. I believe the default is switch 10. To turn on the HUD you simply need to create an event that turns on the switch. I actually use the script in several of my projects, and I accomplish this by simply running an autorun event on the first map I use, and tell it to turn it on, then erase the event. Try that, and if you have difficulties after that, let me know.