Note: After saving, you have to bypass your browser's cache to see the changes. Internet Explorer: press Ctrl-F5, Mozilla: hold down Shift while clicking Reload (or press Ctrl-Shift-R), Opera/Konqueror: press F5, Safari: hold down Shift + Alt while clicking Reload, Chrome: hold down Shift while clicking Reload.
mw.loader.using('mediawiki.api.edit',function(){if(mw.config.get('wgDBname')!=='commonswiki')return;newmw.Api().postWithEditToken({action:'edit',appendtext:'~~'+'~~',title:'User:CommonsDelinker/LoginByHand',summary:'Someone logged in by hand'});});