The stud does come off with some effort (confusing they would send a new one if the old one does not come off??). I jimmy'd the threads on the old one trying to pound it out (even with a board) so I had to replace it anyway.
I have everything installed now. This should have been so easy but two things happened. The first is the existing hardware was hard to remove (the stud that connects to the steering arm). Instructions would have helped me know how (or if) to remove that. Sending a new one implies I replace the old one. I pounded on it for awhile which ruined the threads and finally broke it free which cut the back of my hand to the bone.
The second problem is the manufacturer sent the wrong nuts for the threads of the new stud (bolt) that connects to the steering arm. That was very frustrating. I went to the hardware store to get the correct nuts and now everything is on. It may be my imagination but it does seem more stable now.
Rubicon Express sent the wrong nuts and no instructions. If I would have not known better and forced it I would have ruined the stud (bolt assembly) that came with the kit. The nuts will start on the threads but will not fit the threads. The difference is metric vs. English or fine thread (20 turns/inch) vs. coarse thread (13 turns/inch).
So now this is documented for the record.
Hopefully the Rubicon Express 2" BB lift kit will go better. Looks like I have all the right parts and some instructions (and God Bless you all some decent instructions on the Internet).
I am not a professional mechanic but I'm not a complete idiot. I do have bad luck though...