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Yes it's really seemless in that sense, I signed in using my steemit username and my private POSTING key.

interesting. where do I find my private posting key?

Yeah that's important whenever using any 3rd party service for the steemit blockchain.

Just click your icon, top right, click change password and then on the left see PERMISSIONS, click there. Then you will see all your other keys, you will have to enter your owner key to reveal some. I very rarely log in with my owner key and only on my own main device, when doing transfers for example. Hope that helps :)

Thank you Keni for being the super helpful friendly person you are :)