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When it asks for my password ...I'm not sure which key to put in? The important one ...which I can never lose, or my posting key?

Only put in your posting key

Thank you!

We use SteemConnect which is made by Steemit.com. I believe you can use your Active Key or Owner Key. That said, the donations are optional and go toward powering up the service. When you get to SteemConnect you can skip it and navigate back to Steemit.com if you wish :)

Thank you for sharing!