I want to transfer my dogecoins I have on dogechain.info to block.io

But when I put an block.io address to "Destination" field this happens https://image.prntscr.com/image/FfF9KA8fQeijbSVIozx4aA.png

Also the "Send Money" button is inactive.

Is there any way to recover my doge coins? What can I do?

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Also on block.io I can see there is a option for "Sweep coins from an external wallet address". What is that?

Please help me!