Separate names with a comma.
There should be a button that says 'comment' to the right of this box. ->
As for PMs, go to 'Inbox' at the top of the page. Hit 'Start a new convo', then put your recipient in.
gotcha! thanks bud. found them both. For some reason "inbox" just wasn't making sense to me for writing a private message. Just not ow I go about it on other forums I guess.