[Alneyan]

You would have to ask one of the administrators at PBW to give you the player files for the turn in question. Then, put all these player files and the one from the player who missed his turn in the savegame directory.

After this, log in as the game host and process the turn yourself. The only part you cannot do on your own is to have the previous turn files; since they are store on the PBW server, only an admin can get them for you.