Change the Message Icon of multiple threads.

[CalQdeX]

I have two boards on my forum.
I want to merge the two boards.
Before I move all the threads of Board2 into Board1, I want to change the Message Icons of them so that they will be distinctive from the other threads inside of Board1.

How can I do this?

- Matthew

[CalQdeX]

I can't change the Message Icon of multiple existing threads?