The Parallels Plesk hosting control panel runs on port 8443, so if your web site is example.com, Plesk is at https://example.com:8443/
Unfortunately, unless you have installed an SSL certificate for your site, your web browser will get sent our SSL certificate, and the browser will complain that the name of the site you visited (example.com) doesn't match the certificate presented by the web server (*.elirion.net). You may be able to tell the browser that this is what you expected and to go ahead and show you the site. Otherwise, unless you've been told that this will not work, try visiting https://www.elirion.net:8443/ instead as your web site is likely to be on the same hosting server as the main elirion web site. (If you're on a different server, you'll need to use something like https://bigbird.elirion.net/)
There's a link named "Panel" on the menu bar of http://www.elirion.net/ that will take you to Plesk.
Once you get to the Plesk login screen, enter your user name and password.
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