Withdrawal before an exam must be done no later than fourteen days before the exam. You can do this on StudentWeb:
choose <My active courses> in the top menu
click on the subject you want to withdraw from
click on the button <Withdraw from exam>
Also, in courses with multiple sub-exams, you can normally delete the message for each sub-exam through StudentWeb.
If you are unable to withdraw via StudentWeb, you can send an email to eksamen@uia.no.
Note: Withdrawing before an exam does not give access to a postponed exam. You must wait until the next time the course is offered before you can register again. To get access to a postponed exam, you must show up on the day of the exam and withdraw during the exam. This will count as an exam attempt, unlike withdrawal before an exam.