How do you load maps, mods, ex..

You have to put your mods in the Programs/Firaxis/Civ4/BeyondtheSword/Mods folder. Then you Load a Mod under teh Advanced link in the main menu.

For maps, same thing goes but you put the file in the PublicMaps folder. Then you click Single Player, then load a scenario.

I hope I have been of help.

That is what i have been doing but my BTS is not reconizing the mod/scenario. It only reconizes the ones that come with BTS, GEM, which has an error during the XML load, and Earth 34, which has the same problem

Sounds like an install problem at some point; GEM should load fine, as should the 34 civ map. Perhaps you can be more specific? Or simply ask on the appropriate forum(s).

Are you updated to v3.17? If not, do that. Also make sure the maps/mods are for beyond the sword and make sure they are compatible with the version you are using.