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Once you get somewhere around 500 Steem Power or more in your wallet then SteemIt will start showing you something called The Slider whenever you vote. It'll pop-up when you click the vote button to let you choose the percent you want to vote with.
Personally I wish they would let everyone use the Slider, but that's just the way the folks in charge designed Steem to work.

I use SteemPeak, and they do actually let you use the slider, which is pretty useful, I have to say!

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