There are several different models of Maytag portable dishwashers. Most of the models will look like the one shown in the image below. This image shows the procedure for removing the water supply and drain hose assembly on this type of dishwasher. Be sure that you have the dishwasher unplugged before beginning this procedure.
If you have a different type of dishwasher or need more help, resubmit your question with additional details and the full model number of your Maytag dishwasher.
If you do not feel confident repairing this problem yourself, then you can have it repaired at your home by a Sears technician. Here is a link for the website:
Sears Home Services