Debbi Ohi publishes a great list of writerly chats on Twitter.
To check out the chat schedules go to her webpage dedicated to the subject: http://inkygirl.com/weekview/
Pick the chat you want to participate in, and when the time comes for the chat to take place, go to http://www.tweetchat.com/ and type in hashtag and name of the chat you're interested in. Then have fun! The chats are a great way for writers to connect with one another, promote their works and discuss the craft of writing.