Thread:Project:Support desk/MediaWiki Manual Skinning

Hi, I am new to MediaWiki development and learning how to create a new skin from beginning using https://www.mediawiki.org/wiki/Manual:Skinning. I am doing this on my local server and I am following the steps but I stuck at $wgExtensionCredits['skin'][]. Where we need to add mediawiki url. I am trying to set "http://localhost/MW_1_23_1/Skin:ALSkin01". But it seems to be not working.

It will be great help if you expert can help me to proceed.