Help I cant get my starter off my 92 Dakota!

Go to the auto parts store and pick up a long 3/8" drive extension bar and a 3/8" drive universal joint. You may also want to pick up some deep sockets. If your starter has the 3- bolt flange then you will have to use the u-joint to get to the top nut. As for the length of the extension bar, get one at least 18 inches long. Also, a flex head ratchet helps dramatically to get into tight places.
You may want to try to go over the back of the starter with the joint and extension and pivot the ratchet to get on the nut. Hope this helps.
P.S. Look at the new starter and see how many holes are in it. Some Mitsubishi starters use a 3- hole flange and yes, trying to get to the center one can be a challenge.

Steve