If you have a gas range that you need to convert from natural gas to propane, there are a few things that you need to do. First, you need to purchase a conversion kit from your local hardware store. Make sure that the kit is specifically for your model of oven. Once you have the kit, follow the instructions carefully and make sure that all of the connections are tight. It is also important to have a qualified technician come and check your work before using the range again.