Slight edit to shopify store code.

Hello, we have a online shopify store that sells pet products. We sell customizable dog harnesses and were trying to edit our code to give our customers a text option variant when picking size, color, and variants. We need a custom option for customer checkout to put their pet name/ phone number. While we tried to edit this, we actually made it to where when you click all of our products an error code pops up and doesn't show the product. We need this fixed, as well as a customizable option for the dog harness.