Can't do. you can write some text there, but not in red
I wondered how it was done (in earlier post in this thread), and it was explained. So, I've just tested it - and it works.
I suggest reading the forum thread before stating as facts what is in fact your (incorrect) opinion.
How is it done? In a new query ... (SQL Server 2005)
A) type 'xxxx', press F5 to execute. Note red error message.
B) type in midst of red message the required text in red
C) move cursor to start of red
D) type (in black) and press Enter
QED