Smartsteem is a service that lets you buy and sell upvotes for your Steem account. This means you can let them have your post key and get a reward when they choose you. 
If you want to buy votes from @smartsteem then all you have to do is send at least 0.50 SBD to @smartsteem with a link to your post in the memo field. From there you will go into the next smartsteem voting pool and receive an upvote that is proportional to your stake in the voting pool. This is the best way to help build your Steem reputation and reward.
*** If you prefer to sell your vote for @smartsteem to use then all you have to do is go to @smartsteem's site and then hit 'Sell upvotes' at the top of the screen. From there you will set your chosen power limit and how often you want automatic payment then save and start. From here the bot will vote on your behalf and you will be rewarded based on what the vote chooses. It's a great way to get some extra SBDs along the way.***
In addition you can also delegate your SP to @smartsteem but you do not have it to choose along the way. If you prefer to keep following that route then you simply hit the 'Delegate Steempower' at the top of their website. Then press the blue delegate button and specify how much you want to delegate to @smartsteem. From there you will get rewards based on how much you have delegated them to them.
Image used from @smartsteem
vote up ya @ayi90
Downvoting a post can decrease pending rewards and make it less visible. Common reasons:
Submit