On the default 747 the radio stack for Nav 1 is on the main radio stack panel. SHIFT+F2 will display this panel. You will need to dial the frequency into the stdby radio and press the arrow between the 2 to get it to change to the primary Nav1 radio.
To select the correct course on the NAV display there are 2 ways in FS9 that you can do it.
1. On the NAV DISPLAY (Efis with compass rose) top right hand corner there is a white text it should say CRS XXX where XXX is the heading. If you hold your mouse over this it will show a + or - where by you can click or use the mouse wheel to adjust this heading. See red circle in picture above
2. Press the V key and the the + or - key to adjust the course heading.