There is a library of manuals on this website under the "Tools" tab at the top of each webpage. A manual for your slideout is most likely there, but we need to know your trailer's Brand, model and year to maybe have a guess which of the 6 or so slideout types it is.
You might have better luck by calling Heartland Service at 877-262-8032 tomorrow morning with your VIN number at the ready. They can either advise you, or e-mail you a document on adjusting your slide.