Getting Back to presviously assigned class

I accidentally assigned my class to a new course I was looking at. I can see their course through the dashboard and can have them work in ?it, but how can I reassign it so it comes up first?

Also their challenges no longer show? What can I do to get them back

@mwilson1 Thanks for letting us know. Please submit a ticket and we will clear things up. support@code.org