Vauxhall Corsa D - bleed valve - hotdog

HI I HAVE AVUXHALL CORSE 1.2 YEAR 2006 I WONT TO DO A COOLANT RENEWAL AND PUT IN SOME NEW ANTIFREEZE HOW DO I DRAIN IT AND DOS I HAVE A BLEED SCREW AS I DO NOT WONT TO GET A AIR LOCK THANKS IN ADDVANCE