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.

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.