There are 5 different types of roles for people who manage Pages. When you create a Page, you automatically become the Page's admin, which means you can change how the Page looks and publish as the Page. Only an admin can assign roles and change others' roles.
Learn more about Page roles for connected Pages and Instagram accounts.
Keep in mind that multiple people can have roles on a Page, but each person needs their own personal Facebook account.
Learn more: https://www.facebook.com/help/289207354498410