You must remove the hub and rotor as an assembly so you will need to remove the 4 hub retaining bolts. These hubs are known to seize in the knuckle and can be a real bear to remove so a puller would help along with persistent hammering. You will most likely find that you will need to purchase the entire assembly from Dodge unless you get lucky enough to get the hub out without damage and get the rotor seperated from the hub afterwards.
The stationary part of the hub does not retain the rotor. The rotor is retained by the wheel studs. The rotor mates to the backside of the hub where the studs run through. The wheel studs then press through the rotor and into the hub. Once the hub assembly is removed the wheel studs need to be pressed out or can be knocked out with a punch but care must be taken not to damage the studs. You then place the new rotor over the hub assembly the same way it came off and drive or press the studs through the rotor stud holes and the hub stud holes then replace the hub/rotor assembly.
The problem lies in removing the hub/rotor assembly due to they seize pretty tight as stated above. A slide hammer attached to the wheel studs can help with removal but doesn't always work. You can remove the 4 hub retaining bolts about halfway and use them to start driving the assembly out. The hub may also just come out easily for you. I havn't had one come out easy yet but it can happen. I'm in the northeast so corrosion is a factor here.
No problem. Here is the hub to help understand a little better. In the pic you see the 4 bolt flange that bolt to the knuckle. The actual hub is the round part that is pressed into the bearing assembly or 4 bolt flange. looking at it as it sits in the oic, the rotor drops down over the 4 bolt flange and mates against the round hub. The wheel studs drive through the 2 and keeps them together then the whole assembly, rotor/hub/bearing, bolts back to the knuckle. Since the rotor is behind the round hub the whole assembly has to come off to remove the rotor.
Pictures do help so much.