Recruiterflow comes with six default candidate sources. But you can also create your own.
Simply go to 'Candidate Source' in your Settings menu and you can add your sources.
Once you're happy with your list, save it.
It will then be available in your sources when you are creating a candidate profile or editing it.
Sources once defined cannot be deleted. However, you can replace one source with other.
Some system generated default sources can't be replaced as well.
This is to maintain consistency of data on Recruiterflow.