You can't do that if you don't have a computer with you. You don't have to add the hotel's SSID for it to work, not to mention I don't see the point. This allows you to plug WIRED internet in and make it a WiFi network.
You make your own network and SSID at home on your computer. When you go to a hotel you connect to your SSID which in turn connects to the hotel's WIRED internet. So long as the hotel doesn't have your router blocked (haven't had it not work yet) you will get your hotel's access page when you connect to the SSID you have made. No point in having this AXP if the hotel has WiFi already.