Namecoin GUI is not as friendly as that of Bitcoin and the rest. It is more of command line. There are attempts to make the GUI more friendly but the adaptation rate aren't as good. Most are still using command lines. To get your address for information you will need to key in as below.
The rest all needs command lines to set. One lucky thing is that those using Namecoin are normally experts themselves supporting the Dot Bit domain and hence a lot do have the technical knowledge to use the command lines instead.