<a href="https://findteethwhitening.com/pittsburgh/pittsburgh-dentistry/" title="Pittsburgh Dentistry — Teeth whitening services in Pittsburgh"><img src="https://findteethwhitening.com/pittsburgh/pittsburgh-dentistry/badge.svg" alt="Pittsburgh Dentistry — Teeth whitening services in Pittsburgh" 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.