Use course tools>>Discussion Board>>Participate in a forum
You can search through messages in a Discussion Board forum by author or one or more keywords.
Click Search on the right above the messages to display the Search page.
Indicate what areas you want to search:
All searches the sender, subject, and body of each message.
Subject searches only the subject of each message.
Subject & Body searches the subject and the body of each message.
If you want to search only those messages sent by a particular person, click the person's name in the By Author box.
To search by one or more words, type them in the Keywords box. Separate words with a comma.
Click Any to view messages that contain any keyword.
Click All of these to view messages that contain all of the keywords.
To sort the results of the search based on author, date, or subject, click the arrow next to the Sort by box and click the appropriate entry in the list.
Indicate how many messages to display at once and whether to expand them. Expanded messages display the message body as well as the message subject.
Click Submit to start the search.
Note: Click Cancel to return to the Discussion Board forum without performing the search.