The whitish icon on the upper right between the post # and the red triangular warning sign is to click to give rep power.
When you click on it a box opens up labeled Reputation. Below that is the question what you think of the post. Below that you can choose to approve or disapprove of the post. Additionally there is a box to make a brief comment on the post. Finally below that is a button you must click on to "Add to Reputation".
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