Manuals for many GE appliances are available here: http://www.geappliances.com/service_and_support/literature/
. You will need the model number and there is a guide to find the plaque at the site. Most ranges will have the plaque under the left front burner, on the frame behind the oven door, on the frame behind the drawer or on the left leg behind the drawer or kickplate.
General cleaning procedure for self-cleaning: first use hot soapy water (non-abrasive cleaner, not an oven cleaner) to clean the frame around the oven and the oven door itself. Also clean large spills (acidic and sugary spills can damage the surface of the oven). Remove all of the racks, foil, pans and the broiler pan from inside the oven. Close the oven. Ventilate the kitchen well. Then it depends on the oven type.
If you have a touch pad, press the Clean button and adjust the time for the cleaning cycle (usually with the +/- touch pads). Then press Start. Press Cancel to stop the cycle. The oven will automatically lock and remain locked until the oven cools down after the cleaning cycle. See the documentation for timed cleaning. If you have a dual oven, you will need to press the Oven button for the one you want to clean.
If you have an older range, push the latch to the right and set the Oven cycle dial to Clean. After the oven has cooled, turn the oven cycle dial to Off and push the latch back to the left.
I hope this helps.