You don't add "iTunes" - iTunes is just a program for playing music (essentially). You have a folder full of music on your hdd (typically C: > My Documents > My Music > Music), so you add that folder as the source for XBMC for music
You can also right click the song in iTunes and find out where it is. Not sure what it's called, something like "show info" or possible "show in folder".
The songs in iTunes correspond to an actual file on the filesystem somewhere. You need to find the actual files and then add that location to xbmc.
You could try doing a search for music files. Think search is on the start menu somewher
Yay, I found it. Had to move it to my desktop so I could find it on xbmc. Now I can play music on xbmc. Thank you guys, I'm not very good with computers but wanting to learn. Is there any good things I can do with it now?
If you've moved the folder of music out of the iTunes Media Folder and put it on your desktop, you have probably broken all the links in iTunes now and you're music will most likely no longer play in iTunes
No one said to move the folder (granted, no said not to move it, but then we wrongly assumed you knew not to move it).
Move the folder back to where it was and repopulate iTunes (open iTunes, click FILE > ADD FOLDER TO LIBRARY) and choose the Music folder inside the iTunes Media Folder (which is where that folder of music should have been in the first place, and should be now after you move it back). iTunes should then populate and all be working again.
Then in XBMC, go to Music > Add Source > and navigate to that folder and add it. Done
They should still be in the iTunes Media Folder, in a folder called Mobile Applications. If they are, drag that folder into iTunes. If they aren't, then I don't know where they've gone (or why) but you can get them back by going to iTunes, clicking on Store, then over on the right clicking Purchased > then click Apps, and redownload all