the nut on and tightened to it's stopping point,
turn the water back on, before you reinstall the
handle, turn the ball lever to see if water
leaks out of the assembly when the ball is
moved, if so tighten the plastic packing nut,
this will stop it from leaking, don't make it so
tighy, that you can-not move the handle.
Well that's it.
If you need additional help please use the forum