To approve comments start by signing into your Admin Panel and clicking on "Activity" in the navigation bar at the top of the page.
1) Click the circle on the right side of the comment. This will bring up an "Approve | Delete" link.
2) Click "Approve" if you would like the comments to appear on your site and if not click "Delete".
3) If you would like to either approve or delete all comments at once then click on the drop down arrow next to "Recent interactions" and click on the preferred option.