@Carolm,

You can change the Wi-Fi settings from either the Web UI under the basic tab and then wireless, as seen in your User Guide,  or you can use the Tether app and follow the instructions in this FAQ: How to change the wireless name of your router in the Tether App.

Lastly, even if the name is the same, there is a possibility that devices will either not be able to reconnect or will reconnect with different settings, especially if you had previously configured IP reservations or Static IPs on the devices.