If you have seen the hard black epoxy stuff that Apple (and other man.) uses to glue their components in place, easily viewable underneath the black cover thing around the connectors for an iphone 5 or something. You will know what you are up against, if not take a look...(ifixit has plenty of awesome pictures)

Use a IC Adhesive debonder and a razor blade to slowly and tediously scrap away the black glue on the under side of the motherboard. This covers the connections and must be removed.

Be very careful with the razor blade while removing the black epoxy like adhesive. Scrapping to deep can cause damage to the motherboard and sever important copper traces under the surface.

You have to remove all of the epoxy on top of and around the pins (there are 5 in total). you must get into the cracks and slightly under the metal of the charger port. Failure to do so may result in irreparable board damage.

Be sure to remove any extra adhesve on the top side of the board as well, if this is not removed it will still glue the port to the board.