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Place meat on grill and cover it tightly. If cover has vents, you want to close them as well. Check grill from time to time to make sure it has enough heat to for cooking roast prime rib on grill. If it cools off, you can open events to let flames build up again.
After two hours of cooking roast prime rib on grill, take cover off and check temperature with a meat thermometer. The interior will be about 115° when meat is rare, and 150° is well done. Be sure to check temperature as close to middle as possible.
After cooking roast prime rib on grill to your taste, remove it from grill and let it sit for about 15 minutes before serving. I hope you bought a big enough roast because your guests will ask for seconds and thirds!
Hans is author of Steaks, Seafood and Barbeque guide and the Grill and Barbeque section of Patio Furniture Ideas