To review a proof, click on Proofs in the purple side bar and navigate to the Needs Review tab.
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Click on the thumbnail of the proof you would like to review and add annotations using the tool bar at the top.

To make your decision either click the Make a decision button near the comment search bar or navigate to the Review tab and select either the green check mark (Approve) or the red x (Reject).

If you need to change your decision, click the arrow to the right of your previous decision.