<a href="https://silklaser.org/boston/all-in-one-laser/" title="All In One Laser — laser hair removal services in Boston"><img src="https://silklaser.org/boston/all-in-one-laser/badge.svg" alt="All In One Laser — laser hair removal services in Boston" 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.