We recently moved and the above oven was in the home with no manual. We turned it on and it defaulted to 350 degrees. How do I change the temperature higher or lower? This range is self clean with number s1-9 like on a telephone keypad. There is a warming element. There were installation instructions left for a Part No. 9752777 1998 Whirlpool Corporation 30 or 24" Electric Freestanding Range but no instructions on how to operate it all. Please help.