As each person requests to join the group, you'll need to approve their request in the right sidebar on the Facebook group page. It's nice to welcome them at that point, and remind them to read the pinned post.
Tips for Intermediate or higher level teams: Check their pre-req's
We have noticed that it really helps the titling process to be strict about the pre-reqs in the Spark groups. Check the title holders list... If they aren't on there, send them a message asking for a picture of their title and giving them a link to your Novice Spark group. Here is a sample message you can send:
Hi XXXX, I see that you requested to join the Intermediate Trick Dog Class. There is a pre-req of the the Novice Trick Dog Title. I looked through the list and did not see you; this may be because your name is displayed differently. If you could send me a picture of your trick dog title I can admit you to the class. If you do not have the novice title yet, you may join my novice class at... https://www.facebook.com/groups/CloudK9SparkTeam2/