your email program should allow you the ability to 'attach' a file for sending.
look for a paperclip (type) icon perhaps along the top of the message?
if you don't see an icon for attaching, look under the worded-headers (File, Edit, etc.) for something along the lines of 'insert' - here you should find the ability also.
once you've clicked this, simply maneuver to the place you saved the .rar file and click to attach.
when you send your email, it'll go too.
i hope this is what you're asking and that i'm not being too simplistic (and thus insulting).
