Thanks for your reply

What im trying to do is change the add to cart button to a “Free Sample” button and then have it so that when a user clicks on Free to sample it adds the product priced at £0 to their basket. After trying to do this it messes up my “buy now” button where if its clicked it will still have the product priced at £0 and takes me to the checkout page
I simply need to make sure that when the user clicks on Free Sample button it adds it to basket with price of £0 and for the buy now button to work as it should
I have tried to create dupliates of the product and price it at £0 but that didnt work