openOpen the view where you had created the pages at "projects/%/details"projects/%/details or "projects/%/people"projects/%/people.
underUnder page settings, where you had the path filled, add these additional settings to createdcreate a menu tabMenu tab or a contextual linkContextual link.
goGo to menuMenu and select Menu tabMenu tab as the type and fill in the title. If you want the link to be present as a contextual link, check the box which says context.
You can also set access permissions on who can see this tab depending onupon the permission type you selecthad selected.