Pardon the dumb question: how do you put a 96 XJ in 4wd?

I liked my 96 XJ 2wd so much that I bought a 96 XJ 4wd. But I have a question, and this is going to sound pretty dumb.

How do you put this 96XJ 4wd into 4h and 4L? I'm asking because I don't have a manual, and the guy I bought it from didn't tell me how to do it (he never used it).

Do you have to put the tranny in Neutral?

Another really dumb question here: What is part time 4 wd? Is that only for a 4L situation when the vehicle senses the real is slipping? And where is the 4 wd light.

I know these are some dumb questions, but I don't want to do this the wrong way and grind up the transfer case/driveline. I don't have a manual either.

To go to 4wd high, you just pull on the 4wd shifter. In most cases you can do it up to 55mph.

To shift to 4wd low, you should be moving 2-3mph with the transmission in neutral, and make a smooth, positive shift to 4lo. (Same going out of 4 low).

Part time: very important. Part time systems should only be used on slippery surfaces. Hard pavement is generally out. The reason is that the wheels, in turns, will move at different speeds and since they're all locked together, you can damage the 4wd system. So Part Time on loose (gravel roads for example) or slippery surfaces only.