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You can run ezWalletMenu.js to add a miner. Simply enter in your account name and then your active private key and it'll edit it for you :) If you installed EZSTEEM with default directory settings don't forget to do sudo nodejs ezWallet.js or else it won't be able to write the config file

Can I do this even after creating the miners already?

Yes, you can add/edit/delete them :)

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