GlassFish Administrator Credentials Erased

I WENT INTO GLASS-FISH SERVER AND THEN PROPERTIES AND DELETED THE USERNAME AND PASSWORD WHICH WAS WRITTEN IN IT.NOW EVERY TIME I OPEN THE NET BEANS IT KEEP ASKING ME FOR "GLASS-FISH ADMINISTRATOR CREDENTIALS" USERNAME AND PASSWORD I DON'T REMEMBER IT. DON'T KNOW HOW TO FIND IT OUT AND SOLVE THIS ISSUE.I EVEN UNINSTALL NET-BEANS AND RE-INSTALLED IT BUT THE PROBLEM IS STILL THE SAME.