In cases of extreme duress, you can always drop me a pm. I try to be on irc as much as I can, but I live in north america, which can be a bit of an issue if you're on the other side of the pond.
So, I would:
1: Try RO-LevelDesign
2: Try here
3: pm me
As for your difficulties, sorry to hear it. Can you be more specific? You should be able to click on any wall of the cube and see it become "shaded". Once that's done you sould be able to right click and bring up the context sensitive menu.
UEd tip o' the day: Once you have any face on a bsp selected, typing <shift>-b will select all faces.
Good luck.