Fox, on Feb 22 2010, 07:14 AM, said:
For a reason I don't know, I got stuck at RA tc mission briefing screen. So I can only fo it through usermap selection...
Did you press the "USE" button default "E" like it said at the bottom of the briefing screen.

If so, it maybe possible that you didn't press "YES" when you first installed the mod and that .CFG pop up box came up as noted in the readme.
Although I am not sure how that would have broken the bind for the use key.
williamjcm, on Feb 22 2010, 07:39 AM, said:
I selected the ALLIES episode and the first enemy killed me in one hit.
Do you always stand still when attacking enemies?

Try ducking as well to avoid fire, just keep moving.
EDIT: I seem to talk more about this mod in other threads than the one designed for it.