Check this link for a possible avenue to contact the distributor:
http://www.alibaba.com/product-free/...Rc_Remote.html

The plane is a basic Chinese built ARF that could have been made by any number of companies in China. Contacting the distributor here in the states will be your best bet at getting a manual but not a sure thing by any means.

For future reference adding the detailed specs of the plane do help identify the manufacturer/distributor of a model. Pictures like you posted are helpful as well but as stated earlier, we can't tell if you have a 40 sized model or a 150cc giant scale with that picture. Being nice goes a long way here when you need help. In fact, it is required. Good luck with the plane.