CTCrafter

I figured it out, I think. If you drag the file, it doesn't work for some reason. It let me upload it via browse

Not quite sure where to put this but this seems the closest place I could find. So I'm working on a mod and decided to finally give it a page on the nexus after losing the mod several times and having to rewrite it. However the mod is currently an .esp and when uploading the file it will only accept .rar, .zip, .7z, .exe, or .omod files. I tried putting the .esp into a .zip and a .rar but then it tells me "only upload one file at a time". What do I have to do to upload this mod? How do I convert it to allow it to upload?