MG, you have already selected DIR CRS 009 in the legs page and put the inbound course in the scratch pad to draw your magenta line. You current lateral mode is HDG SEL. Pushing LNAV:Push – •
LNAV Switch
commands AFDS roll to intercept and track the active FMC route annunciates LNAV as roll mode and illuminates LNAV switch light.
•
LNAV Mode
In LNAV mode, the FMC controls AFDS roll to intercept and track active FMC route. Active route is entered and modified through FMC CDUs and can include SIDs, STARs, and instrument approaches.
LNAV engagement criteria in flight:
• commands AFDS roll to capture and track selected VOR or LOC course
• annunciates VOR/LOC armed or engaged as roll mode and illuminates VOR LOC
switch light.
So, LNAV will do as intended and intercept the inbound CRS that is active in the legs page, presumably as the airport is only 10 miles ahead you will select the appropriate mode for the approach you are attempting , VOR LOC, APP, LNAV etc etc, however, until intercept HDG SEL will be Green and above it LNAV in white (depending on A/C fit)