First you have to sign out of Amethyst I think. I had it deleted so started fresh. When I opened the app it showed Amber as an option. But you need to add your nsec to Amber and set it up before you do anything.
Thank you. This worked for me:
  • Download amber
  • Set it up
  • Log out of amethyst
It took me to a login screen with a "Login with Amber" button and that worked
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