As a first step, have a discussion with the faculty member to understand why the grade was issued.
Below is the academic grievance process (flow chart):
For additional information:
Resolution of Academic Grievances: http://studentaffairs.manoa.hawaii.edu/policies/academic_grievance/resolution.php
Academic Grievance Procedures: http://studentaffairs.manoa.hawaii.edu/policies/academic_grievance/table_of_contents.php
Responsible Office: Office of Judicial Affairs
Contact: (808) 956-4416 or email email@example.com