Well first off if you are trying to edit a step.rc then you have ots1 version of litestep. You should scrap ots1 and move to ots2 version.
Get it here
To load a module in the new version you must know what module you want to load.
Here is the place to get modules.
OTS2 has a theme.rc not a step.rc
In OTS1 to load a module you do
you will need to define your settings for popup2 in the step.rc or you can place the settings for popup in another file and do what they call an include in the step.rc
This works the same in OTS2 however OTS2 has a download manager called netloadmodule which goes out on the web and downloads the modules needed automaticly.
So to load a module with ots2 themes it would be
Notice there is no .dll and there is now a version of the module at the end.
The best thing to do when you are new to this is look at other themes and try and figure out how they did it.
If you move to OTS2 dont make the mistake of adding
popup2-.2.0 open and close brackets around the module name. Even if it arrives on your desktop after downloading it that way.
OTS2 themes install automaticaly by just renaming the zip file once downloaded or by saving to disk and renaming the .zip to a .lsz extension. Once there just double click and if the theme is OTS2 it will open netloadmodule and download the modules and the theme should fire up.
This is a good way to test your own themes.
Always zip the theme then go in and delete any thumbs.db file to save file size and then rename the zip to .lsz and see if it installs before releasing.
I covered more than nessesary but wanted to help you out down the road. I hope this does it for you...
I'll check back and see if you need more help later.