Accessing a Blackboard organization requires that you self-enroll. This is quite straight-forward.
After logging into Blackboard, select "Community" (to the immediate left of "My Institution").
On the Community page, enter your search term in the field on the left - just one word from the organization's title is enough - and select "Go".
Internal Server Error
The server encountered an internal error and was unable to complete your request. Either the server is overloaded or there is an error in the application.
On the next page, "Self Enrollment", select "Submit".
Log out and log back into Blackboard. Select the "Community" tab and you will see the organization listed under "My Organizations". You have Participant, rather than Student, status.