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If you look at this site, there are a few tools for converting your STEEM to other currencies. It would need to be your liquid STEEM though, rather than your STEEM Power.

If you're planning to remain on Steemit for a while, I'd recommend continuously powering it up and growing your account. Then, curation alone could earn you a couple of hundred STEEM per week.

Thank you very much, then that's what I'll do. They kept it safe until one day I need it, and the truth is, I don't need it now.

If you don't need it then I'd definitely leave it in and keep powering it up as much as you can. Not only will it increase the rewards that you earn through curation (voting on content by other people) but will also show you're committed to the platform which could attract more votes from similarly minded people.

You tell me to send it to the sp?

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!