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The following screenshots with links to help guide you in getting the right information on to the social adventure and for others to be able to add you ingame- as friends.
What you need is the Username. Capitalization needs to be as see on the screen.
This is the way to get to all social adventures that the family is apart of as well, in general, in case looking for other games.
This section houses all social adventures that the family they take pride in playing. While here you may also find other games and new friends and family to enjoy side adventures with.
This is the page which welcomes you to join us. As shown you'll click on Join Adventure. Which will bring you to the next page.
The following page also will be a confirm screen to join the adventure.
Click on the Join Adventure button to continue on.
On this screen, you will enter the Bethesda.net username here and click on the save button. NOTE: If you join but didn't have the Bethesda ID at the time or if you find you made a typo, you can edit anytime by clicking on Edit profile button that will always be on the main Fallout 76 page once you have completed the join step.
When this happens you will see that Fallout 76 Progress will show your Bethesda.net username instead of unknown player.
Beyond such hope this guide helps you join the ranks of this game or guides you to the social adventures in finding other games and meet new family to play with.