[bashy]

Hi

in your admincp, then vbulletin options, its under the
Message Posting and Editing Options

If you enable Quick Reply, a box will appear on the showthread.php page allowing users to reply to the current thread without needing to load the full newreply.php page.

When Quick Reply is enabled, you may specify whether or not users must click the Quick Reply icon in order to start typing in the Quick Reply editor.

If you choose not to require a click, the system will not know to which post a user is replying, making both the threaded and hybrid display modes non-sensical.

We strongly recommend that you set the option to require a click if you use Quick Reply and have Threaded Mode available on your forums.

3 options are

No
Yes - Click Not Required
Yes - Click Required

Hope this helps a little