ok, if you host your own server, there should be a console that pops up when starting it...
in that console, type in "start realdriveby".
If your server is being hosted by a hosting company like (Cranked Hosting) then there should be a Game Panel where you have options like starting/stopping your server or restart...
now I would go in-game on to my server and type in "/register myusername mypassword" then go in to my Game Panel and stop it then edit the ACL.xml file.