The web publishing engine starts upon initial deployment when the option for "Yes, enable web publishing" is selected. If the server is already deployed without web publishing enabled either redeploy or click the "Start Web Publishing" button in the top left corner of the FileMaker Server Admin Console (see screen shot below).
Please note that you posted to the Report an Issue part of the forum. It is intended for posting possible bug reports. Had you posted this to the FM Server Forum (see tab at top of screen), your post would have been seen by more people and probably gotten a quicker response.