How port mirroring is activated on TL-SG2008 switches, when they are managed by Omada SDN (OC200 v4.4.6)?

There is a "Mirroring" icon on the management page, so it seems, that there should be some way to enabling it. But, when a port is selected to being edited, there is nothing except port name and profile. And, on profile management, there is nothing related to port mirroring.