How to amend product additional info in Fashe theme


I’m trying to amend the information in the ‘Additional Information’ section on a product however, this section does not appear in the shopify admin of the product. So how do I amend this section?

I would also like to amend the colour of the squares for the variants, again there is nowhere in the product admin to do this, that I can find.

I have attached two images to illustrate the above.

Please inform me as to how I can make the required changes above.