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You can change the logo of your wiki by altering the $wgLogo variable in LocalSettings.php to the name of the image you want to use as a logo.
Please note that this logo should be placed in the /skins/common/images/ folder.
Change MediaWiki Skin
To change the skin of your MediaWiki, log in as administrator and click on "My preferences" in the top right of the screen. Then click on the "Appearance" tab - you will see a list of all available skins:
The default skin is called Vector. You can preview each of the available sking by clicking the Preview button next to it.
To save the changes to your MediaWiki appearance, click the Save button.
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