Quick Qns: How to add the button "BUY FROM AMAZON"


I am new to the FSB. I wish you could help me on this.

I've searched everywhere but I still have not found the option to activate the "BUY FROM AMAZON" button or the "View on Amazon" button.

I only have the button "ADD TO CART" for the moment.

Please, please advise on where can I activate this.

You can also refer to the attached image to understand what I am talking about.

Thanks in advance!