How do I change the bulb on a Christmas Inflatable balloon?....?

We have a Three Kings Inflatable yard Balloon and the internal light has burned out.....I was just wondering if anyone else has had this issue and can help me on how to replace the bulb safely without breaking the balloon...Thanks and Happy Holidays to everyone!How do I change the bulb on a Christmas Inflatable balloon?....?the ones i have have a zipper on them that you unzip to change bulbs. check it over for a zipper.