Reset counter brother printer hl-6180dw - Brother International HL-6180DW hl6180dw laser printer

By 'Counter' do you mean Toner Counter or Drum Counter?

For Toner Counter - This is done by the gear on the side of the cartridge. The gear when looking at it travels counter clockwise lifting outwards as it passes over a mount in the fill cap. Starter Cartridges do not have the gear in place and this needs to be put in when refilling the cartridge.

For Drum Counter - Have the front of the machine open (As if changing the cartridge) and press the Go button on the machine till the display reads Drum Changed or Drum Accepted.
If it requires you to press the back button then it will have a message "Change Drum" with an up arrow and down arrow for yes and no.