Cisco Wireless 1200 series Access point

Hello all, does anyone know how to change the DHCP range that a Cisco 1200 series Access point gives out, the IP for the AP is 10.20.x.x, and it give out IP’s in the 192.168.x.x range, does anyone know how I can get it to change to the 10.20.x.x range as this is the range that I want the computers to be on.

Thanks in advance for your help.

CG._