You can get your seed words using #Amber signer. Go into your settings and seed words are a back-up option.

nostr:npub1w4uswmv6lu9yel005l3qgheysmr7tk9uvwluddznju3nuxalevvs2d0jr5 it does not appear that you can input seed words into Amber to add that account for signing. Is this a planned feature in the future, or am I missing something?