Please, can someone show me how to add an external link to my buy button. Am using a sense theme.

[Nonso]

liquid code

[PaulNewton]

Hi @Nonso 👋 if you mean dynamic buy buttons those are injected into the page automatically.

https://help.shopify.com/en/manual/online-store/dynamic-checkout 

Modifying them is not a good idea, and kinda not possible with only liquid.

If you just mean any old button that should be as simple as <a href="url.com" class="btn">Link name</a> in a custom-liquid block

Exact syntax or CSS classes will vary by theme.

Otherwise you need to put more effort into drastically improving the quality of your question than just a title and two words for a description:

https://community.shopify.com/c/blog/how-to-get-support-from-the-community/ba-p/1399408 

If you need this customization created for you then contact me for services.
Contact info in forum signature.
ALWAYS please provide context, examples: store url, theme name, post url(s) , or any further detail in ALL correspondence.