You have to flip the switch on the module plugged into the OBDII port to bat. Then the tuner display will light up. Select "Install Tune" it will have "Premium" "Regular" "Trail" and "Stock" choose the one you want. Then it will show different things like shift point, redline, top speed limiter, tire size, gears, etc. Skip the ones you don't want and adjust the ones you do. Just make sure to hit save after adjusting or it won't make the change. The just follow the display while it install the tune. You will have to turn the key on and off and push continue numerous times before it is done.
I had to plug mine into my computer and do the download twice, before it worked. If you don't see install a tune, then you may need to re-download. The little instruction thing is pretty good, once the download takes.