How do i stop my ikea futon from creaking! Its made of wood?

Posted under sofa futon

I have an ikea futon This is the pic
http://www.ikea.com/au/en/catalog/products/S29817421

We were stupid enough to spend a lot on it.. And spent extra on the futon mattress too which is so thin that i folded it and used it only on the seating part.. and a attached a double folded comforter to the back to support the back..
But even now , this stupid futon lets out a horrible creak when anyone sits on it.. My Friend says its just bcecause its wood, as i paid a professional a lot of money to assemble it correctly..
I cant afford a new sofa or anthing right now.. Can someone please help me by telling me how to stop the creaking? Its so embarrasing when people visit and sit on it!..
Its assembled correctly.. And this futon model is a sofa bed too , so its higher in front and lower at back.. please look at the website pic and details

First loosen the bolts and buy some Bee'z wax's. Put it in between the wood joints. Then tighten all the bolt. Works great on any bed that squeaks. You can also try paifon wax it's the same as candle wax.

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