Using your Fire-Maple Compact FMS-103 Gas Cooker is a breeze. First, make sure the cooker is on a flat and stable surface. Connect the gas canister properly. If you're using it for the first time, check the connections carefully. To start the fire, you'll need an external ignition source since it doesn't have a piezo ignition. Once the fire is lit, you can adjust the flame according to your cooking requirements. When you're done cooking, turn off the gas supply and let the cooker cool down completely before folding it up. As for maintenance, keep it clean after each use. Wipe off any food residues or dirt. Store it in a dry place to prevent rusting. Also, regularly check the gas connections for any signs of wear or damage. If you notice any issues, it's best to get it checked by a professional.