Access Point can be configured in 2 ways.
1. If the Access Point is a Router or a Modem, You need to configure it along with the internet settings of the router/modem. Generally the Internet Service Provider (ISP)'s settings are not necessary to configure an Access Point. The settings you need are the SSID (Name of the Wireless Network), Wireless Channel and the Wireless Security. Click here to know more about wireless settings and here to know about Wireless Security.
2. If the Router or the Modem you using doen not have wireless functionality in it, than you can connect the Access Point with a cable to the router/modem, configure the wireless settings and start broadcasting.
To use the Access Point as a Repeater, view this post.
Lets see about the Cisco WAP200E Access Point.