Go to the archeology trainer Erudite Darenis in Dalaran, coordinates (48.8, 36.8), find the method as follows:

1. After entering the game, click on Dalaran Ran's teleportation stone answered Dalaran.

2. Go back to Luyin Square, as shown in the picture below:

3. You can also find soldiers asking about the location of the archeology NPC.

4. After finding the archeology trainer Erudite Darenis, you can see the exchanged items after talking.