installation of heater element and computer board

My dishwasher does not finish drying the load od dishes, I figure its the heating element, I just purchased it with the coumputer board. What do I nee to do or where can I get instructions to replace these parts:confused:

Here is the Service manual.

Here are the breakdown diagrams and http://www.appliancepartspros.com/partsearch/model.aspx?model_id=5138152

Gene.