hi… i previously transferred my seed phrase from metamask to trezor…. i am using my old ethereum address because some of my tokens are staked using that address… however, i would like to put a passphrase to that address for further protection… is this possible and how? thanks
Please see following thread as It answers your question:
TLDR: “adding” extra layer of protection (passphrase) to addresses that has already been used is not possible. Only option would be to create new, hidden (passphrase protected) wallet and transfer your tokens there.