Most of Brown's postdoctoral searches are advertised on the Higher Education Recruitment Consortium of New England. Open searches are the most common form of postdoc recruitment in the humanities and social sciences. Many faculty in the natural and life sciences do not advertise postdoctoral positions, and you are encouraged to contact them with inquiries about postdoctoral training.
If you have trouble with Brown's application site or in contacting a faculty member, please contact the postdoctoral affairs staff in your academic division.