Integrating a Website Carbon Badge from websitecarbon.com

Dear Support-Team, I would like to integrate the website carbon badge offered by websitecarbon.com for https://www.stiftung-meeresschutz.org/ They say it's quite easy: "It’s really easy to install it on your site, just add the following lines to your template wherever you’d like the badge to appear" The relevant code can be copied from here: https://www.websitecarbon.com/badge/ I have no idea how and where to put that in my template. Can you help? Best regards Ulrich