Add Product option on Paypal

How can you change Product Option label?  I want to write "Size" instead of "T-Shirt"

I cloned your form and have it working the way you asked here. If you would like to see:

https://form.jotformpro.com/71916231823959

To change the Product Option label you need to:

#1. Click edit on the product (the pencil icon)

#2. Click edit on the T-Shirt option (pencil again):

#3. Scroll up, and you will see the label for the product option.

Change it from "T-Shirt" to "Size"