Hi Rose,
It should be almost the same for all phone. You can follow this guide:
Installation of Cisco Expansion module 7916
When you add an expansion module new Cisco IP phone, the module acts weird. Sometimes there is no label displayed.
First reset the phone by unplugging the Ethernet cable and plug back in. Press # during the power up time. Press 123456789*0# when the button lights are moving one to another. Wait until the phone downgraded to factory default. Then the phone will be upgraded to latest firmware from the call manager. Once the phone is upgraded to latest firmware, the firmware will be displayed under active ID in call manager under device properties. Then plug the module, add the module name under device, module section and save the config. Then apply the config. The expansion module will start to work.
Link: http://callmanager111.blogspot.com/2010/03/installation-of-cisco-expansion-module.html
Regards
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