I lost a pin for the right knob that help out with folding so my icoo stroller doesn't fold. Can you tell me where to buy the parts. Home depot doesn't have that size screws and pins.

Pins? I don't know your model but most stroller prams use Capped Starlocks if its a pin with a looped top and spits in two at the bottom it's a cotter or split pin. any hardware can help with those. Any thing else is a custom part and a problem.
http://www.bakfin.com/starlock/starlock-sample-box.html