How do I post to a topic?
Go to Discussions.
Select Discussions from the Tool Menu of your site.
Click on a Topic.
Click the title of a Topic.
Click Start a New Conversation.
Enter a Title.
Enter a title in the Title field.
Add Attachments. (Optional)
Optionally attach file attachments to the message. Click the Add attachments button to browse for and select a file from your device.