I am sorry that you are having some difficulties with your range and I will be happy to help. I suggest you add to the thread of this question and include the full model number of your range so that the expert can provide you with a more detailed answer. I did manage to find a link in where you can enter the model number of your range and if available the owners manual will pop up. I hope this helps with your range troubles while you wait for your expert response.
Reply with the model number of your range and we should be able to help you. The model number may be on the side of the opening to the oven cavity. It may also be on the base of the range in front of the right (or left) front leveling leg. Open the bottom drawer to view that area (if it has a bottom drawer). Once you find that model number, you may be able to find the manual using that link that Joseph P. posted in the above response.
That owner's manual should have the procedure for cleaning the oven.