Cant Send Messages to players

[Osiris]

After you establish contact with your opponent, you need to send your game files and game emails via your own private email, not the Blitz email.

thank you for getting back to me

I think it maybe a tech issue because on the matrix site I can use their forum message application to send messages to other players...I am not sure why I cant here. I cant even send a message to you because it wont let me type in the message body...So I hit send anyway and it a red bar pops up asking me to add a message...