<a href="https://plately.org/los-angeles/big-city-cakes-catering/" title="Big City Cakes &amp; Catering — catering services in Los Angeles"><img src="https://plately.org/los-angeles/big-city-cakes-catering/badge.svg" alt="Big City Cakes &amp; Catering — catering services in Los Angeles" 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.