You don't.  It is automatic.   Believe they (SD) has said they are having problems with the Metaverse so you might not be able to see your games.  Also sort stopped working.  I'm sure they will get it fixed soon

There are 3 ways to find yourself in the Metaverse:

1. The easiest way to find yourself is to click the GalCiv3 menu button "Hall of Fame" in-game. This will take you to your Metaverse profile on the GalCiv3.com webpage. Make sure your GalCiv3 game is up to date!

1. Alternatively you can click on the "Login" button at the top right of the Metaverse page. You will be prompted to login to Steam. Then hover over the "Welcome" button and click "My Profile" to view your GalCiv3 profile page.

1. One area of potential confusion... the GalCiv3 Metaverse uses your Steam profile name, which can differ from the username you use to log into Steam and your Stardock.com account. Click on your profile picture in the top right corner of the Steam homepage to view your profile page. This shows your profile name at the top. Once you have your profile name you can enter that in the search box at the top of the GalCiv3 Metaverse to find your profile.

The Stardock Games team is working to enable linking your Stardock.com / forum account to your Steam account. This will make the process easier in the future as well.

-Adrian