There are numerous IRC clients from which to choose or you can visit our chat room or directly right here or from your browser using webchat.freenode.net.
Try addressing someone directly by putting their complete user name into your question. This might get their attention faster. You should also consider posting a message to OpenMRS Talk.
Command to type
What it does
Sets your current nickname to YourName
Sends message to NickName in a private chat window
Sends text in a 3rd-person sort of way, e.g., "YourNickName starts to dance"
Shows you additional information about NickName
Logs out of IRC
There are a lot of other commands available. Search the web for information about them.