To contact the slippery pin:
Write your message on the whitest paper you can get, in ink made from red beetle shells, or black gel ink. Fold the paper into its own envelope. Draw an arrow in the dust in the direction of the Slippery Pin. Place the message on the dusty arrow. Burn the envelope. Make sure all the paper has burnt up.
We here at the Slippery Pin reply to every message. But due to the high volume you may have to be patient.