How do you use Cisco Wireless Router for Wireless Access Point?

I have got a Cisco 871 wireless router and am having some issues configuring it to act as a Wireless Access Point for my small internal network. After using Cisco SDM Express, if I am trying to change the lan interface IP from its default 10.10.10.1 to 192.168.0.99 then I am getting an error connection lost. I am also not certain under the Wireless section for Router which IP Protocol IP Address and Sub to use for Radio0-802.11G. So can anyone tell me what IP to use for WPA Radius server. Thanks for any help.

You might want to contact a local Cisco source. Normally, wireless routers are not designed to act as an Access Point inside the Lan, but you can get there. I am not a Cisco guy so I cannot tell you what is required on that device. It will eventually save you many hours if you are bringing someone in and will be done in 1 hours or so.

Thank you very much for the answer, I will try to do what you have suggested and see if that works.