HOW DO I MAKE MY TARGA DR - 5400 X DVD RECORDER REGION FREE???

HI FOLKS, I RECENTLY PURCHASED A TARGA DR - 5400 X DVD RECORDER AND MY EXPERIENCE TO DATE HAS BEEN ALL FAVOURABLE. HOWEVER, THIS EVENING I TRIED TO PLAY REGION 1 DVDS FOR MY KIDS & IT REFUSED TO PLAY THEM. CAN ANYONE PLEASE ADVISE ME HOW TO CONVERT MY MACHINE TO MULTI REGION AS 70% OF MY DVD COLLECTION IS REGION 1. I THOUGHT AT THIS STAGE ALL MACHINES WOULD BE MULTI REGION. I HOPE THIS IS NOT GOING TO BE A COSTLY MISTAKE!!!! ANY ASSISTANCE WILL BE DEEPLY APPRECIATED.