Farcaster Devs

Any farcaster dev watching this please help them....I sign-up in firefly app and stucked there I want to use my account in warpcast app

I have the impression you ask how to export your key from Warpcast and the answer is you cannot export it from Firefly.
If you actually want to export the Warpcast key, go to your mobile app settings > Advanced > Reveal recovery phrase.

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Not sure what the implication may be of using this key elsewhere, and if the app you import it to can change something that will confuse Warpcast.