Sorry it took me so long to get back to you on that. I did exactly what you suggested, redrudolf, but all that did was create another ‘bbPress (Twenty Ten) 1.2 by WordPress and bbPress teams’ theme. Thanks anyway.
I have been trying other things too but can’t seem to work out what I should be doing – I think I need someone to walk me through it step by step. lol
Let me try that just now and I will get back to you if it works (or if it doesn’t). 
Thanks for your response. 
At the moment I think I need to create a ‘child theme’ of the bbpress so that any changes will not be affected by a future update – after which, it is time to play with the css. How? I’m not quite sure (yet).
