Gecko Theme: How to add custom input text field in product page?

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Hi All

Can someone teach me how to add in 2 custom fields on just ONE product page? I can’t seem to find the product-template.liquid file as Gecko theme has different layouts. I am currently using product-layout_1 template.

The 2 Custom Fields required:

Pet Name: <input field of up to 5 alphabet>
Charm: [Drop down Menu of 5 items]

i can edit the name of the items on my own.