Hi how do i switch from the gps mode to nav mode? when i click the button on bottom of the hsi it only witches to nac for a second then it goes back to gps mode? i need to fly the ils somehow. I would of read the manual but adoe reader hangs before it opens any files. appreaciate any help.

In the default panel, you should indeed be able to switch the HSI with the switch on the bottom of the HSI.If you have the RXP GNS installed, you switch it on the GNS, using the CDI button.