Thanks, I first had to write something in the identity field to make a public key. Here it is:
6TJYqySs3J8fbkDvp6Dt3B4vL2Pyobooy9Ww3DeSYi3nbTUUNu
Modify:
I cannot find a send button.. What do I have to do to send the message?
Update: I found it. The big button left top corner. After clicking it the program crashed
Update: Crashed of unknown something. Please someone try to send a message to me, thanks