Yousendit help needed

Hi, does anyone have any experience sending files with yousendit? I suppose this is quite a straightforward question, but I'm having trouble making any sense of it.

I'm trying to send music out, so first of all I create an mp3 using Realplayer, then put the file in my desktop. That's when the problems begin - I try to send the file to my own e-mail address using yousendit, as a test, but when it arrives it always says '0 bytes'. Any ideas what I'm doing wrong here?
I'm also not too sure about what the file is called once it's in my desktop, if I'm being honest. I don't even know if I'm giving yousendit the correct information.

As you've already noticed, 'technology' is not exactly my middle name, so if anyone could give me a clear guidance through the entire process of creating an mp3 using realplayer, naming it for reference, where to stick it when it's done, and how to yousendit I'd be really, really grateful.

Don't be afraid to speak very slowly and very carefully!

Thanks!
BJ