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Hey there apologies for the late reply. the steemit update meant I had no credits to post. Quite annoying! You can buy steem on exchanges? and then convert to SP. Please check out my article on Steemit where i descibe how the tokens work within the steemit platform. It may give you a better understanding

its ok dear and i have 1 more question why my resource power is decreacing fastly not deacrese my votting power fastly but my resource power is decreacing fastly

It all has to do with SP. the more you have the more interaction you can have. I am in the same boat as you