Some other previous topics that have dealt with this:
https://forum.inaturalist.org/t/share-a-project-link-via-qr-code/41088
https://forum.inaturalist.org/t/using-signs-to-engage-new-participants-to-collect-data-via-inaturalist/41098
Some other previous topics that have dealt with this:
https://forum.inaturalist.org/t/share-a-project-link-via-qr-code/41088
https://forum.inaturalist.org/t/using-signs-to-engage-new-participants-to-collect-data-via-inaturalist/41098