Translations:Manual:$wgDefaultSkin/5/en

Note that this only sets the default skin. This skin is used for anonymous visitors and for those registered users, who have not selected a different skin (e.g. in the user preferences). Registered users may change from the skin preselected in $wgDefaultSkin to any one of the other available skins through their preferences page (see Manual:$wgSkipSkins on how to control that).