I figured it out. Maybe not the best way but it seems easy to me.
My two buttons are product review and faq.
I added this code to the <head> tag:
<script>
function product()
{
document.getElementById('product-reviews-tab').click();
}
function faq()
{
document.getElementById('questions-tab').click();
}
</script>
Then for each of my tabs I created IDs under Settings for each. I named them product-reviews-tab and questions-tab.
I then linked each button to each the IDs section. This makes the button when clicked scroll the page to the tab. It doesn’t seem to add the click though.
So I added to each button a custom attribute. I set Name to onclick and Value to product() for the product review button. And I set Name to onclick and Value to faq() for the faq button.