Delete the directory that contains those skin files.

I found out that adding and removing skins is that easy when I moved Planque's custom skin to a new folder "flpanque" and my skin list grew by 1.

Thanks for the reply but I know how to do that...my problem is that I want to keep the skin (Plain) as a different blog is using it, but don't want to show it on the list in my blog.. :'(

rename the dir of the skin you want to use but exclude from your skinlist to something with an underscore in front.

for example the dir custom will become _custom

:D :o Thanks so much Topanga!! Exactly what I needed! I learned something new at the same time as well. Because "_Plain" was no longer showing up in the default skin section in the admin for my other blog, I forced it on it by editing it's file instead..worked. Anyways, thanks again! :)