It is normally not possible to give evidence anonymously when you are examined in court.
In special situations, however, the court may decide to withhold your name and address from the defendant, for example. If you think the defendant should not be given this information, you must contact the court or the person who summoned you for the court hearing.
In some situations, the court may also decide that the defendant cannot be present in the courtroom while you give evidence. In that case, the defendant will either sit in another room where he or she can hear your testimony, or your statement will be read aloud to the defendant when you have finished testifying.