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If you go to your wallet (Select 'My Wallet' from the Navigation and then if you click on your STEEM, you'll see an option to "Power Up":

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This will convert your liquid STEEM (that you can withdraw instantly) to STEEM Power which you can use to vote, etc. When you decide to power down, it's a 4 week period with 1/4 of your STEEM Power converting back to STEEM each week.

No problem. Drop me a line if you have any more questions.

I complied a lot of articles in this post which should be helpful and explain how much more there is beyond the blogging element.

Good luck!