<a href="https://toxaura.com/san-antonio/san-antonio-med-spa/" title="San Antonio Med Spa — Botox injections in San Antonio"><img src="https://toxaura.com/san-antonio/san-antonio-med-spa/badge.svg" alt="San Antonio Med Spa — Botox injections in San Antonio" 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.