<a href="https://lumered.org/chicago/perspire-sauna-studio-2/" title="Perspire Sauna Studio — red light therapy studios in Chicago"><img src="https://lumered.org/chicago/perspire-sauna-studio-2/badge.svg" alt="Perspire Sauna Studio — red light therapy studios in Chicago" 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.