If capable, an adult can revoke an appointment under a POA: British Columbia Power of Attorney Act, s. 28(1). In order to revoke a POA, the adult must give written notice to each attorney: British Columbia Power of Attorney Act s. 28(2).
This notice is called a notice of revocation and a donor must give the notice of revocation to any financial institutions or other third parties where their attorney may have acted for them. A revocation is effective when notice is given or on a later date stated in the notice: British Columbia Power of Attorney Act, s. 28(4).
To cancel a POA dealing with land, a donor must file a notice of revocation with the Land Title Office where the land is registered.