When you first begin PushPin, you will encounter a list of forum topics. Click a forum topic to view its message index. The beginning of a conversation starts at the left side of the screen. As people reply to them, the conversation moves to the right to indicate that they are ongoing messages.
Every thread begins with a single message.
From here you can see the times at which these messages were posted. Any message that has been posted in the last 24 hours will have their dates appear in a bolded type face so you do not have to guess which ones are old and which ones are new. Click a message topic in order to view the message. After you read a message, you may wish to reply to it. Posting a message allows you to begin a new discussion thread within a forum.