Help! Dolphin Diagnostic Replacement of side with electrical cord

Hi, newbie here, and this is my first blog...Any words of wisdom will be so greatly appreciated! I have a Dolphin Diagnost Pool Sweeper, I Love it!!! I have a small crack on my sidewall on the electrical cord side. I have replaced the other side, which was a no brainer, just need some helpful words on how to make this happen. I am sure it is not that hard... my dolphin has had no problems whatsoever and I need to get her back in the water soon! Thanks again ... Keilanii