No problem. 
Go to the linked wiki page above,  scroll to the bottom,  download the file from FS Mods. 
Unzip into its own folder in your main FreeSpace folder - NOT into Data or any other folder, just FreeSpace/Bretonia. 
Within Bretonia create a Data folder. 
Within Data create 3 more folders - Models, Maps, Tables. 
Your file structure should now look like this:
Freespace 
->Bretonia 
--->Data
----->Maps (place textures here, .pcx, tga etc) 
----->Models (all .pof files) 
----->Tables (the .tbm file goes here) 
Open the FreeSpace open launcher called, handily enough,  Launcher. 
Click the FEATURES button. 
In the command line space type this EXACTLY:
-mod Bretonia
Done. 
You should also have the Media VPs already installed. 
These are also basically a mod,  but Always go last on the command line, I. E. :
-mod Bretonia,MediaVp etc
NOTE no space between Bretonia's comma and the M of Media... 
Enjoy. 
I'll include the Bretonia in future uploads. 
BH