Propane tanks are measured by weight; if you plan on doing a lot of grilling, get a heavier tank with more gas inside. If you're only going to be using the tank a few times, opt for a smaller propane tank. You can find propane tanks at your local supermarket or hardware store. Set it as close to the grill as possible so the grill hose will be able to reach it. If the knob on the gas tank is turned to the on position, turn the knob to the off position. For most propane tanks, you'll need to turn the knob clockwise to turn the tank off. The safety cap is the plastic cap covering the valve on the top of the tank. Grab the tab on the safety cap and pull to remove it. The grill hose is the hose attached to the underside of the grill. Turn the propane tank so the valve is facing the grill, and connect the end of the grill hose to the valve; you should feel the end of the hose click into place. Once the end of the grill hose is attached to the valve, turn the knob on the end of the grill hose clockwise to tighten it into place. Continue turning until the knob won't turn anymore. The grill rack is what holds the propane tank underneath the grill. Check the manual for your grill for specific instructions on how to attach the tank to the rack. If the grill doesn't have a grill rack, leave the propane tank on the ground, next to the grill.

How would you rephrase that briefly using Chinese?
找一个烧烤架用的丙烷气罐。 把丙烷气罐放在烤架旁边。 检查气罐是否关闭。 拿掉气罐上的安全盖。 把烤架上的软管连接到气罐的阀门。 将气罐放置在烤架的支架上。