Trying to set up Airport Express as range extender
I successfully set up my new Airport Extreme base station. Now I want to add on my new Airport Express to extend the range of WiFi. I plugged in the Express, opened Airport Utility, selected the Express icon on the left. I get this message: "Setting up this AirPort wireless device requires switching wireless networks. Switching wireless networks may interrupt your connection to the Internet." What does this mean? Should I go ahead and click "Switch"? None of the directions in the manual or discussion forums mention this message in their instructions. I am timid! Can anyone advise me?
iMac and MacBook Pro-OTHER, Mac OS X (10.6.7)