Finding an email address/Attaching .bte files

[MikeC]

I'm trying to start up a new game in TOC. I got a response, and clicked on the "Email" button to contact my opponent, but this utility would not allow me to attach a .bte file to start the game.

I looked at my opponents profile here at blitz, and could not find an email address to directly contact the other player. 
How do I find an email address or attach a .bte file?  What am I missing? 

Thanks,
Mike