On payment and satisfaction of legal charge or an incumbrance, noting on certificate of title to be accordingly

When a legal charge or incumbrance on or over registered land has been paid off and discharged, the person entitled to the legal charge or incumbrance shall sign the prescribed instrument and, when it is presented to the Registrar, he shall cancel the noting of the legal charge or incumbrance upon the certificate of title, and file the instrument, in his office as his warrant for making the cancellation.