<a href="https://microglow.org/san-francisco/the-treatment-room/" title="The Treatment Room — microneedling treatments in San Francisco"><img src="https://microglow.org/san-francisco/the-treatment-room/badge.svg" alt="The Treatment Room — microneedling treatments in San Francisco" width="300" height="84"></a>

Paste it into your website — most site builders (Wix, Squarespace, WordPress) have an "embed code" or "custom HTML" block. The footer is a good spot.