Amy
Near the top of the page you will see the logo "my messages" that is if you have made enough posts to enable to use it, I'm not quite sure how many it is these days but it is certainly no more than ten. If it is available to you just click on it and then click new message. Just put Chris in the to box and the subject in the subject box and where it says message just detail what you want, give Chris a day or so to answer because he is a busy man, but I can't see any reason why he would refuse such a request.