Well Charity after passing your licensing exam you are to apply for a Job from your choice of employer. This is what the Ministry of Health says about it:
The requirement shall be the provision of academic and professional certificates and good reports of internship for both self and government sponsorship candidates. Appointment letters shall be issued by the Employing Agencies which are Ghana Health Service, Teaching Hospitals, Christian Health Association of Ghana and the private sector. The employer may decide on the condition of service, salaries, promotion intervals and eligibility for further training. Yearly appraisal shall be held and awards provided for excellence. The employing Agency has power of Hiring and Firing. Employees must abide by code of ethics of the employing Agency.
Hope it sheds some light on the issue.