How to disconnect Mbox2pro from Mac

[jessmachine]

Hi, i install an Mbox2pro interface to an old macbook pro2019
firewire via, all works good but when i want finish audio issues
i dont know how to discconect correclty the interface
cos don't have button for turn off
I don't wanna make mistake unppluging firewire on warm
Manual of mbox2pro don't said nothing about how to turn off

Hope somebody know the right answer.

[musicman691]

Turn computer off, disconnect the interface, restart computer.

[jessmachine]

Thanx