After choosing a starting article (and optionally changing the language):
click a link below to go to the Wikidata item or property page for that article where you can edit the item/property OR
click the text of a field below (e.g., "Bahá'u'lláh"), and if there are subproperties, they will be displayed inline which can in turn be expanded (e.g., then click on the place of birth of Baha'u'llah, Tehran, to see details about Tehran and so on):