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I'm sorry to have to honestly say, after some research, that there is no such function listed for your model of Brother printer.
You can print through the USB port, of course... but that refers to printing from a computer through that USB port.
This is where the USB port is located on this model - inside the machine, oddly:
But it is explicitly for connecting to a computer:
However, one other use for the USB port is mentioned: for connecting directly to a Mac AirPort Station or router that has a USB port.
That is not USB drive usage, however. But it might suggest an avenue toward use of the printer.
Also, if you are locked out of Bluetooth usage etc., that may be deliberate - this model allows locking out of some printing functions. To try to turn the locking Off (if it is indeed On) go to
and if that is set to On, try setting it to Off... it will require an Admin passcode of four digits. But if you were lucky, that passcode might be something simple and 'default', like