Pmdg 737-600/700

 

You tune both NAV radios to the ILS frequency, sometimes it is also necessary to select the runway QDM in the Course window.  Set the aircraft up to fly into the localiser for the runway, then prime LOC on the glareshield.  As soon as the aircraft captures it, it will turn toward the runway.  At this point you can also prime GLIDE in the same way, by pressing APPR (or similar).  You must also engage both autopilots (A and B, or 1 and 2 depending on a/c), if you want to autoland.  In an airbus, as long as the speed is in managed mode with the autothrust engaged it will maintain the correct approach speed.  In a Boeing I think you have to dial the speed down manually with the speed knob.  You also have to manage the gear, flaps and spoilers manually.  When the aircraft nears the ground, it should start to flare, then it will land.  Then you disengage the autothrust and engage reverse and stop.

And, have you pressed the 'APP' button?

 

If not, or if you don't know what I mean, I'll make a video for you showing it if you want?