@andy
Under “Move to this account from an older account”, put in the handle of your account in this format: @oldaccount@yourfirefishserver.social.
Click the “Save” button.
Performing the migration:
On your old firefish profile, go to
https://yourfirefishserver.social/settings/migration
(Or navigate there from Preferences > Account > Move to a different account > configure it here)
Enter your new handle and your current Firefish password
Click the “MOVE FOLLOWERS” button.
*Please note that most services only let you migrate once every 30days.