You can write anything on a link, but do you want your email out there. When someone leaves a message in this site, you see over to the far left my name, where I am located and below that "email" and "PM". Click on one of those 2 choices and keep in mind that when you email someone, they now have your email address to respond to. As for a PM you click on that and then you leave them a BYC online message that they can press "reply" to and send a message to you. Also, if you want to go talk online in the BYC there is a chat that frequently is with a very few people at certain times a day. 
Good luck!