In order to access your MediaWiki via the server URL (http://servername/~user) instead your domain, you should edit your LocalSettings.php file. It is located in the root directory of your MediaWiki. You can edit the file from:
cPanel-> File Manager
Replacethe following line:
$wgScriptPath= "/wiki"
with this one:
$wgScriptPath= "/~username/wiki"
Then you can use the following link to access your MediaWiki:
http://servername.com/~username/wiki/
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