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You're close. After you get over the 319 Steem Power you will start seeing the slider.
I see you have 306 SP and 68 SBD in your wallet. Use the Market to change some of that SBD to steem, and then Power up the STEEM. You should be good with about 14 more steem.
That is off course if you want the slider that bad :)

I think I'll just try working harder see what happens. Thank you