HAHAHA. So, when I suggested a search, as there are literally 1000 threads on this; no one listened?
It costs 10 bucks and takes about 20 minutes. If you want the write up, please look in the Maintenance section. The driveline has multiple grease fittings. You take a grease gun with the appropriate grease and fill each fitting up with grease.
In the maintenance section, there are much better write ups that literally explain every detail. If you physically able to lift a soda bottle (weight) and able to lay flat on the floor or sleep, then you are physically able to do this.