Take the unit outside, so it knows where it is (you cannot tell it you want it to go from a location to another without being at one of the locations). Once the unit has a satellite fix, press Where To? Then press Address. When West Virginia and Spell State come up, press Spell State. Enter Florida (or start to, until the unit pulls it up, then press it). Then press Spell City, and enter Crystal River, then the house number and street name or number. Press Go! and you are on your way.