Your fediverse username [@yourname@flipboard.com] is located on your profile and you can copy it in Flipboard’s Settings for easy sharing.
On iOS:
Go to your Profile tab (bottom right corner)
Select the gear icon to enter Flipboard’s Settings
Select Edit Profile
Tap Copy Federated Username to copy
On iOS iPad:
Tap the red ribbon
Select the gear icon to enter Flipboard’s Settings
Select Edit Profile
Tap Copy Federated Username to copy
On Android:
Go to your Profile tab (bottom right corner)
Select the gear icon to enter Flipboard’s Settings
Select Flipboard Account
Tap Copy Federated Username to copy
On Web:
Select your Profile (top right corner)
Select Settings
Select Federation Settings
Click Copy Federated Username to copy