How do I loosen the brass regulator from the babeque grill. I need a new regulatore but the can't remove the old one. Please help

Are you talking about the connection to the tank or to the hose? This could be a reverse threaded connection, lefty tighty. Mr. Heater Hose and LP Regulator - 12ft. Length, Model#F273072 (http://www.google.com/products/catalog?hl=en&cp=16&gs_id=1q&xhr=t&q=propane+tank+regulator&gs_upl=&bav=on.2,or.r_gc.r_pw.&biw=1675&bih=824&wrapid=tljp1315165396904028&um=1&ie=UTF-8&tbm=shop&cid=615408048877034591&sa=X&ei=7dRjTvKCB6vKsQKs0rC7Cg&sqi=2&ved=0CFsQ8gIwAw#)

Loosen from the hoose

Open my link from the last post, most new regulators come out of the box with a new hose attached. What you are working on is regular thread, turn counterclockwise to loosen.