Hi MizzCarmen,
To apply for a marriage annulment you have to apply to the Family Court, then serve the other party with the application so they are aware of the proceedings. The other person then has the opportunity within 28 days to file an affidavit in response to your application which they must serve on you if they disagree with the application. If no response is filed the court will hear the application in their absence.
A court will grant an annulment order if based on the evidence you have provided they find that the requirements have been met.