First off, I'm not trying to make my own modules. I just want to figure out how to use modules others have made. At the moment, I'm just toying around with the custom modules that came with the custom ship editor, specifically the Mortar. I've read the links, as well as the brief help file provided in the ship maker. I'm trying to follow Foxx's instructions he had in his custom module topic.
1 - Put the ShipFile in your PF Ship Folder. (C:\Users\YOURNAME\Documents\My Games\particlefleet\ships)
2 - Add all Scripts into the Script folder with the Map you want the Ship(s) in.
(C:\Users\YOURNAME\Documents\My Games\particlefleet\editor\MAPNAME)
3 - Add Images to the Map. [Images are Named according to the Image Sloth Name they go to]
4 - Make an Invisible PRPL Core outside the Map and Attach Master.prpl to the Core.
5 - Make a ShipPickup with the Ship you want. (or add the Ship to the Map)
6 - Run Game -> Pickup the Ship and Build your Ship. (or build from the ShipList) [Most Custom Modules take 30 Energy to Build so make sure you have enough of Energy to save time]
(or you can use "B" in the Editor for Instant Build)
Anyway, I got three script files. Shipmodule.prpl from the custom module thread, and two script files generated by the ship maker. zz_robot_Mortar and zz_adder_Mortar. The help file in the ship builder said that a 'moduleadder.prpl' it generates will serve as the master.prpl. I'm assuming in this case, it means the zz_adder_Mortar.
I've run into some issues. First off, when I go to add the image to the map, there's six categories that show up after I click the 'Custom Images' button in the map editor. (64x64, 128x128, 256x256, 64x64pp, 128x128pp, 256x256pp). I've no idea which category I should add the image to. I guessed the 64x64 one, since the mortar image itself was 64x64 pixels in size. It doesn't seem to be working though, as instead of the mortar images, theres just the default PRPL core graphics. Additionally, these PRPL core graphics are too big, and don't rotate with the ship when it turns.

Lastly, despite the graphics error, I tested the ship against some particulate, but the mortars weren't firing.
(Also, what's an Image Sloth? I assume it's a typo, and supposed to be Image Slot)