Dogechain wallet > import/export > export unencrypted > yes, i understant the risk.

copy that privat key from "priv" and go create another wallet or you can import it whereever you want.
I also asked what is the "SWEEP" thing on block.io in my first post. Can you please help on this matter?
im sory but im not using block io so i cant tell you what it is cause i dont know either.