The places can be found in the following location: In all cases, you can press TAB on the PC to highlight the names.
In the West Brecilian Forest, behind the ancient tombstone.
In the Denerim Alienage, next to the large tree.
In Ortan Thaig, next to the altar of sunder (it's nearby Ruck; you've got two bridges on the other side of the river, the altar is before the bridge, which is located lower.
In the Apprentice Quarters in the Circle Tower. It's in the middle of the room where the stairs are to the Senior Mage Quarters, the stone circle with a table on it. Click on the back of the chair in the middle.