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on your instagram or youtube site put a link to your dtube or steemit, or even just make a video that says what your dtube account username and post that to isntagram adn youtube. you need to prove that you control those accounts. even just a screen shot of this conversation posted to youtube or instagram would do the trick. just post something anything on youtube and isntagram that says that you are alex-fitness on dtube/steemit

ok , thanks