This might sound Stupid…

Hello All,

As some of you know I just recently got a 4x4 88 Ramcharger, I dont really know the "rules" of putting it in 4 wheel drive. It says on the visor that I have to be moving, what is the speed to shift into 4 wheel drive, and shifting out. Can I not switch it while parked? Info will be greatly appreciated. I'm new to the 4 wd scene haha