Hey guys, this is a stupid qustion i know but i bought a unit off a friend in italy and the manual is in italian.How do i just change the navigation language to english!

You can download the manual in English from here:

http://www.pioneerelectronics.com/PUSA/Products/Navigation/ch.In-Dash.Archived?vgnextfmt=Archived

Just click on whichever unit you have and then go to the "Documentation" tab.