This iguana is in desperate need for you to take it to a vet. If you can't afford that, then you can't afford to have an iguana.
Vets are generally sick and tired of ill-equipped owners pleading for pro-bono work.
If you don't get it fixed right away, the eye will become infected, oozing green mucous, and the infection will rapidly spread to it's brain. The retina is at the back of the eye, and it's nerve bundle runs through a hole right behind the eye, directly to the brain.