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I missed this one. Go to ecency.com and login with your old account. Set it to English mode if not already on English mode. Click on your icon and choose "Profile". Then click on the "Settings" tab. After this, click on "Change Password." I think your private active key will let you change your password. I have not tested this with the Proofofbrain.blog site. I'd be interested to see whether it works the same there.