If your newtork is setup in a way that the router assigns dynamic IP addresses (It's in router operation mode) and you want to change the passwords and SSID  of the access points, you will not be able cause even if you put in the IP address of your access point you set to it, you will be redirected to the routers interface but to make it possible, change your router to access point operation mode and access your access point via it's IP address via the web and put any controls to it including changing the passwords