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Ahh okay I see what you mean. So in order to adjust your voting power you'll need to either have 500 SP in your account... or use www.busy.org which is another Steem interface (like Steemit) which has some added features, including a vote slider. So when you vote on a post there it will let you adjust how much of an upvote you would like to give.

How do I determine how much voting power that I want to give? I see that busy reports the amount of SP, but will it be the same as on Steemit?

That's totally up to you. You can upvote at whatever amount that you like. And yes, Busy and Steemit are both connected via the blockchain. So whatever you do on one happens on the other.