How to add new meta fields.

Hello team,

I am using your metafield app editor. There are some fields I created for products.

I want to add some more fields for the products. how can I add these new fields?.

Whenever I created new fields, it needs to show in all the products I just have to enter their value. How can I do this?
Here is the store URL: https://somethng.myshopify.com