Login to blacboard.
Go to Radha Padmasolala Organization
It displays list of collaborate sessions as follows.
Click the purple blacboard icon.
Following screen appears .
At the bottom left of the screen,
You will see the following message
Click the Keep
Now at the bottom right of the screen the following icon appears.
As soon as you click that, The Java 7 icon appears as follows for a few seconds
Then the blackboard screen appears.
Click the OK button
Now you can chat, share screen and also video if you have a webcam.