You need to be logged on to reply to an existing post.There are two ways to reply to an existing forum post:1. Click the "Reply" button and compose your reply in the "Message" field. Add any documents or images (see "Including a document in a forum post" and "Including an image in a forum post" above), then tag your reply and click "Post".
2. Click "Quick Reply", compose your message and post. Using "Quick Reply" does not allow you to add documents or tag a message, and restricts your ability to add an image.