GE water dispenser - Model PXCF22RBS,Serial #AS506535M, GE profile - would like to know how to turn temperature up or down and what red button is on back?

http://products.geappliances.com/MarketingObjectRetrieval/Dispatcher?RequestType=PDF&Name=49-50245.pdf

Red button on back is a reset button if heater runs dry so as not to burn up,I'm not familiar with exactly where t-stat is located but could be under cover where elect.comes in.unplug before servicing hope this helped please rate my answer thanks