You extract statics0.mul ( I think thats what it is called) from the ZIP file you downloaded off exploiter.
Then, you drag statics0.mul into your Ultima Online 2d (or 3D) directory. It should ask you if you would like to replace the existing statics0.mul with the new statics0.mul. The file size should be the equilivant of 20.9 MB.
Just press yes, and be on your merry way.
Also, make a backup of the original statics0.mul file, just incase you have a problem.
I put it as Computer-Noob as I could, hope it helped.