Steps to install the module can be found here:
Regarding removal of an old module, this may be necessary, but it would depend on the Bus device number on your system. You would have a Bus failure with a unit number listed after the swap.
You can manually delete a bus device by entering the installer menu and going under System Configuration > Accessory Modules > Bus Device Settings
To delete learned unit numbers:
- With the display showing BUS DEVICES, press #. The display
shows the bus device set to unit number 0. - Press A or B until the bus device unit number you want to delete is
displayed. - Press D. The display changes the unit number to None.