unplugging radio

[canuk7]

G'day all,

I have what is probably a very simple problem. Thanks to the Forum I have been able to pull the radio out of my au1 forte but am unable to disconnect the wiring harness from the back of it! Its a white plug and just will not budge. Can anyone tell me if there is a correct way to remove it or is it just in there tight. I dont want to force it and maybe damage the wiring. Any help appreciated!

Thanks