Minor Prestashop Website amendments

Hello !
I would like to make some changes on my prestashop website. such as:
– Change of Icon for size selection (i.e crossed when out of stock)
– Quick add to cart on mobile to change to ‘view details’ and take to item link instead of add to cart
– For some reasons there are 2 cart pages on mobile. the one that shows automatically does not have ‘Promo code’ field but it is visible on the other view. We need Promo code field to be visible on the cart.
– Forgot password email is not sent. This is because we have previously disabled all email communication from Prestashop since we are usine MAILCHIMP for Order Status notifications. we need to keep everything turned off except for forgot password link.
– Add a rule to have -15% on the full website/catalogue.