Hello,
we have some very old pictures int the dev manual that should be replaced
https://fusiondirectory-developer-documentation.readthedocs.io/en/1.4/fusiondirectory/pluginsystem/start.html#displaying-the-plugin-in-fusiondirectory
https://fusiondirectory-developer-documentation.readthedocs.io/en/1.4/fusiondirectory/pluginsystem/attributes.html#usersattribute