You are departing from an uncontrolled airport:
Quote:
Frequencies for WP: 0 KAXX
Mul - 122.8
Uni - 122.9
Grd - 0
Twr - 0
Clr - 0
App - 123.5
Dep - 123.6
FSS - 0
so you should contact FSS to open your flight plan, then taxi, and tune an advisory frequency (Unicom or Multicom) to announce you are ready to take the runway. If there is no designated FSS frequency (as appears to be the case here), the default FSS frequency is 122.2. Once airborne, tune Departure frequency and press 0 to make contact.
Usually the initial frequencies are shown on the FS kneeboard when you first connect (if selected, as you have done) but I'm not sure if this works in P3D. If you do not usually see a list of frequencies when you first connect PF3, run the PF3 Display utility (pf3_display.exe which is located in your PF3\PF3_Displayer folder) after you have connected. If you click and hold on "Dept Freqs" at lower right, a list of departure airport frequencies will appear and should show the frequency data above.