To create your PayPal Buy Button you can follow this guide to generate the code for the button on PayPal.
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Once the code has been generated be sure to copy it down and have it ready to add in the editor.

​To add the Buy Button to your website:
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Login to your account and then navigate to the editor.

Select App Integrations
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And then select Third-Party Integrations
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From here click the Add a third party integration button and find PayPal in the popup that appears:
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You should now see a field where you can enter the code from earlier:
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After adding the code press back, this will take you back to your list of added integrations. Toggling the switch will enable the ability to add the button to your pages.
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Navigate to the page you want to add the button to, and click the add a section button. You will be able to see your button under the category "Section Integrations".
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Once you've added it to the page that you want the button to appear on click publish and it will now appear on your live site.