How to add CTA buttons on product pages?

[Nickahola]

Hello all.

I've searched for an answer to my query but haven't found one yet. 

I'm wondering if there are any apps that allow me to add a CTA button on any page - specifically the product page and pages that belong in the footer of the website?

What I want to do is add a button on the dog stroller product pages to link to a page I've written about measuring your dog. I know I could hyperlink it but I was hoping there was something better looking and more obvious, like a button.

Then I would like to add buttons on my 'how to measure your dog' page to link to further pages.

A product from my store: https://www.silverstork.co.uk/products/innopet-hercules-2-0-xl-dog-pram

Thanks!