The username for the Facebook social media icon is found by
Clicking on Settings in Facebook

2. The username in Facebook is shown under Username. In this example, my username is bzechwalker

Add the username on the profile card under Manage Links.

The username for the Facebook social media icon is found by
Clicking on Settings in Facebook
2. The username in Facebook is shown under Username. In this example, my username is bzechwalker
Add the username on the profile card under Manage Links.