If you don't want to be guessing or looking up usernames, you can use the @blueshirtdude button above the reply area, between the video and code buttons. It prompts a "enter a username" area where you can put it the current screenname and the web will start giving suggestions.
Oh, I got a phone. It's a basic, normal, home phone. Not a cellphone, not a smartphone... you can't take pictures with it, you can't send text messages with it, just a good old 'used-to-call-people-and-receive-calls-from-them' kind of phone.
Now that's a useful device. ^_^
Nothing is impossible, it just hasn't been done yet.