use more complete publishing instructions

Author: hectorsector

responses/publish.md

@@ -1,5 +1,9 @@
 Your course is now complete! Let's publish it. 
 
-Merge this PR.
+Activity: Publish your course
 
-Then go to https://lab-sandbox.github.com/{{ owner }}/new and type in this repo's name. 
+1. Merge this PR.
+1. Confirm that you are an owner of the **{{ owner }}** organization, or a member of a team named **lab-assistants** in the **{{ owner }}** organization. 
+1. Navigate to https://lab-sandbox.github.com/{{ owner }}/new.
+1. In the Repository name field, type in **{{ repo }}**
+1. We recommend selecting **Private** so you can test the course with other members of the organization before making it public.