Welcome, Kathleen! When you're logged in to your ALA Connect account you should see a link to "Chats" in the column on the right hand side of the DLDG page. If you click on that link, it takes you to the chat page for the group. I have set up a test chat (called, imaginatively, "test"), if you want to try it out. If you post a message and can see your own message, you're good to go.
Helice