Hello. I have some problem to landing with PMDG737NGX.

I will explane my situation.

1) I pushed VOR LOC button when empty diamond appeared.

2) I pushed APP button and I checked localizer captured.

3) When glideslope captured, I pushed CMD B.

4) SINGLE CH is not appeard at PFD, but LAND3 appeard when 1,500ft.

I enter ILS frequency at NAV1,2 and I active that.

What is matter?? help me please

First, please note PMDG forum rules require we sign our full names on all posts.

Second, why do the think LAND3 is a problem.  I you want single channel then simply use only NAV 1.  I suspect you have not flown the Tutorials, which is highly recommended.