Do you mean in the first part, before the actual scenario?
Well if you mean that...
you first need to have the bitmap... then you have to fit it to the scenario.bmp (must be same size) then you need to put your .bmp file into the main AOK directory... THEN after that, go into the editor, and in cinematics... you need to press the right arrow for the scenario instructions option...
I hope this helps ya!