Assuming it's a Lippert slide, you don't, and be thankful it's in! If it gets stuck out the solution is to move the motors up so they disengage from the gears, and then lock the slide in place with a couple of 2x4s until you can get it to the dealer.
There are some troubleshooting tips though, but I don't have time to find and post the links right now. Please post if it's not Lippert so I don't waste my time later.