Until now i too didnt knew about steem power (sp) i did some search and found out about it.
STEEM Power (SP)
Steem Power (SP) is STEEM (see STEEM_Tokens) that has been bolted in, vested, which means it can't be quickly pulled back to spend.
Steem Power is the thing that gives you impact on Steemit.[1] The more SP you have, the more cash you provide for creators with an upvote and the more prominent the curation rewards you can gain. There is a little 'premium' rate earned by holding Steem Power.
Changing over STEEM to SP in rang fueling. This should be possible by tapping the down bolt beside the STEEM in your wallet and choosing power up. 1 STEEM = 1 Steem Power when controlled up.
To open SP and change over it back to STEEM you need to begin a "Shut Down" process which moves 1/thirteenth of your Steem Power every week once again into Steem (which is spendable) more than 13 weeks. So for instance, on the off chance that you have 1300 Steem Power and shut down, you will have 100 Steem seven days opened into something you can spend, exchange, exchange or pull back.