Every Sion user has a unique identifier that you can use on third party services such as Virtuoso.com.

To get your Sion Identifier, click your username in the top right of Sion. In the dropdown, select User Profile.

This opens the Your Sion Profile window.

Click on the Identifiers tab.

To copy the identifier, click the papers icon next to the number.

You can now paste your Sion Identifier wherever you need.