Manually enter coordinates

Really a newbie here. Bought a mio 168rs have been playing around with it, having some fun , what I would like to do is manually enter the coordinates, is there a way to do this? Also I tried to find a town in Indiana but it not on the map, I loaded the right US map but found everything but, is there a map upgrade. I also could not get on the site to register my ppc is there some sort of trick? Thanks in advance for the help.