Once you enter the 'room" there should be an elongated white text box at the bottom of where you can see everyone else's messages. Your cursor should be blinking in the far left corner of that box. If it is, then you can type in your message, then hit "enter" and it should show up in the public chat text box above where you typed.
Also, if you want to send a private chat message to one of the others who are in there, go over to the right where it shows who is in there and use the drop down menu to choose Send a message and click on their name. Then you type the message, as before, click enter, and it will show on your screen and theirs, but no one else will be able to see it. It should also show in a different colour than the public text.
I listened to the NEA Concert last night on a radio station lamarca linked for us. It was wonderful!! So nice to hear you!