Go to www.forestriverinc.com
and scroll down the page to "owners manuals". Click on that and then select "fifth wheel English 2015". I know you have a 2013 but these manuals are generic and not specific. Once you click on that, on the next page go to leveling jacks and slide operation. Then on the next page at the right hand side is instructions for the various slide systems they use and there are instructions on how to manually operate the slide. Hope that helps.
Oops, I just took a look at the FR web page and they have made some changes to it. At the top click on "tools" and then "interactive manuals" then "forest river rv" and then the fifth wheel manual.