I guess that will be done by using color tags
Tutorial:
Warcraft III clolor tags and linebreaks - By h3ih02
If you mean how to find the floating text, you might find it in the Gameplay - Interface
@ Destroyer25: The color is a detail that will be taken seriously in reviews when/if he realeses his maps. I'm sure if he does, he will get a + if anyone notices. Anyways I think a respond like yours are not needed in threads like this (exept from your first 2 words)