Ok, I created a folder in Library/Textures titled Quake3, and in the folder titled Textures so basically "library/textures/quake3/textures". I got de_dust for Quake3 and I unziped the .pk3 and took out the map and put the texture files in "/quake3/textures/" and then when I import the bsp file it says "Could not find the BSP File!" and then comes up with another box..
I even did what it said and extracted all of the pk3 files into that folder, still no change.. *shrug*