How to make a picture on my iphone 4s nit blurry?

I really need help i got a pic with someone and its really blurry so are there any apps or someway to fix it cuz its kinda with a boy who i like Help

Blur is either caused by camera movement or subject movement. If the iPhone was being used in low light, the shutter speed was probably too slow to hand hold the camera without creating blur.

There's NO post production fix for these problems.

You will need to either take photos of the boy you like outside or by bracing your camera against a wall or table and hope he does not move during the exposure.