My Comms panel is blank so i can't change ant frequencies??
Have you turned it on? The power control is on the far left of the ARCDU, just below the screen labelled as "OFF - ON - BOTH - FMS" (ignore the red ring in the image below).
The next thing to consider would be a fonts issue, you can usually fix this by copying the contents of C:\Program Files (x86)\Microsoft Games\Microsoft Flight Simulator X\Fonts to the Fonts area of the Control Panel.
Beyond the above you'll need to contact Majestic directly for support.
(http://majesticsoftware.com/mjc8q400/sample_flight/img_240.png)
Apologies it's the dreamwings version i'm using.
Ah my mistake! Tbh I haven't used the Dreamwings package in nearly 3 years so I'm not the best placed person to answer, although I do recall the panel by Dmitry Stepin has hidden clickspots on the radio panel.