Resteeming is a thing wow didn't know, now I do.
I tested 2 post by resteeming them and it works nifty.
Now to see if it helps me get more Steem Power :)
But what I have also learned it is a better thing to create your own content and make contents you will earn more than resteeming but that is an option.
Yes look for that little button and click it.
And when you click the icon you will get the above popup when the popup shows then you need to decide if you want to resteem the post so they ask you to confirm the resteem.
If you clicked OK then that post will be resteemed.
Hope that helps.