Mods and the map editor

[Fyron]

If you use the mod launcher, select the mod from the list, and hit Edit Maps.

[Andrés]

Originally posted by Ed Kolis:
(I have the Imagemod installed but none of the Imagemod planet pictures show up...)

The Imagemod is not a mod by itself, just a collection of pictures that can be used by other mods.
You have to use a mod that adds new sector types and other required data changes, such as FQM Deluxe.