How do i remove blower motor resistor on audi coupe b3

[IHK 11]

Hi my heater blower motor has stopped working on settings 1,2 and 3 but works well on 4. I think the problem is the blower motor resistor.ive bought a new resistor and i was just wondering if anyone knows how to remove the old one. I dont know if it clips in or has bolts. I just dont want to damage anything and cant find any videos showing how to do it.  The cars a 1990 Audi coupe 2.3e B3. Thanks.