Is this already being managed by a controller? If so, you can "move" this AP to a different controller by re-provisioning it. You can also change the IP (if it's static) as well by re-provisioning it.
If you prefer the console, reboot the AP while you are connected via console and interrupt the process. At the "apboot>" prompt, issue the command "printenv". You will see all the variables present. To change one, use the command "setenv" along with the variable and values.
Then issue "save" and then "reboot"