changing colour of a link (not working)

to understand what i mean look here...

http://thinkery.forumotion.com/forum.htm

in the column LAST POSTS the username admin is in a royal blue colour and i can find a way to change it.

as you can see it clashes with the board colour.

also, does anyone know if i can ask someone for help to make my board look better, at the moment i am struggling to get the look i want.

thanks