Exam

See here https://www.accaglobal.com/uk/en/help/exam-sessions.html
You make make changes including withdrawing an entry, changing exam centre, variant exams or entering for more exams until the standard entry closing date – which was 26 April for the upcoming June session. The late closing (3 May) has also now passed.

If you are talking about June and there are mitigating circumstances why you have to cancel (e.g. medical/bereavement/family commitments) I suggest you contact ACCA directly
https://forms.accaglobal.com/contact-us

If you were entered for an exam at a centre which has been cancelled and you have been offered remote invigilation, this is a choice and you should be credited if you choose not to sit remotely.

(And please remember to give posts an informative subject title.)