Thread:Project:Support desk/Intern tasked with a Media wiki projectand I'm lost/reply (3)

WinSCP is useful when you have FTP access. PuTTY is for SSH access. In your installation, inside the file LocalSettings.php you will find the access data to the MySQL database; maybe you have phpmyadmin available on the server, if you want to access that. If with "not given access to the mediawiki application" you mean that you do not have an account, meaning you cannot log in to the MediaWiki user interface (e.g. on the page Special:UserLogin), then you can use the maintenance script createAndPromote.php to create yourself an account from the shell via SSH.

How extensions can be installed is explained here: Extensions.

Basically SSH, FTP and maybe an admin account inside MediaWiki are all you need.