Sounds like you have the lock nut off. Next is the washer with holes, that just pulls off. Under the washer with holes is another nut like the outer lock nut that needs to be removed.Then the hub and rotor assembly will pull off. The rotor is held on the hub by the lug bolts. a shop press or a hammer is used to press them out.
When installing the hub and rotor back on the spindle the first nut will have a small pin that fits into the washer with holes. This locks the first nut so it won't move. Take care to get this pin allined with one of the holes in the washer, then install the outer lock nut.