In Myspace, hover your mouse over your main profile picture and you'll see a link in your browser at the bottom of the screen. Mine looks like this:
http://viewmorepics.myspace.com/index.cfm?fuseaction=user.viewAlbums&friendID=65435510
At the end of the link you see your friendID. Mine is "65435510".
If that doesn't work, right-click your profile pic and choose "Copy Link Location", then paste the link somewhere you can read it, like the address bar at the top of your browser.
Copy (or write down) the number, now you have it!

okay so i know you're getting about a hundred of these, but i tried all of the codes i know to see who is sending messages to my truth box. And all of them suck. This place looked pretty tight so, please help ? i can give information if this isn't specific enough,