Meet management made simple.
Is there a written User Guide?
Not really ... there are these support forums and a number of videos. For the most part things are pretty simple/intuitive. Search for something first and if not found then ask and people try to help. There was a "help wiki" at one time, but it got so clogged with junk/spam that I think it was scrapped.
You will find links to what there is here: http://racetab.milesplit.com/page/user-guide