<a href="https://stowcar.com/nashville/100-oaks-self-storage/" title="100 Oaks Self Storage — car storage facilities in Nashville"><img src="https://stowcar.com/nashville/100-oaks-self-storage/badge.svg" alt="100 Oaks Self Storage — car storage facilities in Nashville" 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.