hello @gct its the reward payment made to your account by steemit for having read and voted on posts !! You now have a scaled vote with a nice slider which allows you to decide exactly how much steem power currently available to you to put onto a particular post you have read and liked !! Look at Steemstats.com to see the green horizontal bar which indicated your voting power available. This decreases the more you vote so preventing you from voting on too much and anything. So you do need to choose. Pick a post you like the look of, select upvote from the menu below the post and then adjust this sliding steem vote pressure i mentioned earlier here and all done. If you pick a good post and a whale votes after you its a good thing as you recieve more reward for that quick decision , but its actually better to vote at the plus 21 min mark as this is ion the voting algorithm. But if you vote behind more influential voters than you, ie whales with more steem power, if you hold less voting power it is less significant and less rewarded. I hope this helps you !! Took me awhile but it good fun if you like reading !! steem up and on !!