Access the Discussion Board by clicking on the Discussion Board link located in the navigation pane on the left side of screen in your Blackboard course.
Step 2 - Upload your Document
Click on the title of the Discussion to open it
Click on Add New Thread
Enter a Subject and a Message (description) for your post.
Scroll down and click on the Browse button.
Browse to your file by selecting the Destination.
Next, select your document by clicking on it
If you have successfully uploaded a document to the Discussion Board, you will see a paper clip icon next to the subject of your post.