This recipe works for:
SharePoint 2010 Foundation
SharePoint 2010 Standard Edition
SharePoint 2010 Enterprise Edition
Office 365 (SharePoint Online)
Open your Team Site. Select the Team Discussion link from the quick-launch menu.
The list of current discussions is displayed. Click on the Add new discussion link.
In the Team Discussions—New Item dialog box, enter the Subject and the Body for the discussion item that you want to create.
Click on Save.