Why is the 'Buy it Now' button missing on my product pages?

Why did the “Buy it Now” button on my product page(s) disappear? Can anyone help get it back? Website: discountotc.com

  1. Go to Online Store > Themes and find the theme that you want to edit, and then click Customize.

  2. Open the drop-down menu at the top of the page and select Products > Default product.

  3. Choose the Buy buttons section

  4. Check Show dynamic checkout button.

  5. Click Save.

I already had it selected and the button still isn’t showing, is there anything else you can suggest?

I tried that but it did not work. Is there anything else you can suggest please?