Below is a screen shot of the Configuration tab:

In order to publish, you need to select whether you want to: 

• publish to the world (2nd choice)
• publish to a select group (3rd choice) 
• save the packet.

To unpublish a packet - go back to Configuration:

• select #1 (see below - red arrow) 
• click on "Save Packet" (green button - lower right)
•  

Your packet will no longer be available to Sophia users.