From version 7.0, XuanXuanGo provides the function of connecting to
PandaNet(IGS) to play or observe Go games. From "Play" menu, choose
"Web Go", or use right-most toolbar button, you will see following
dialog box:

If you don't have an IGS account yet, you can press "Sign In"
button to register an account, then you can save it in XuanXuanGo so
that you don't need to input it every time you log on to the server.
After you logon to the server, you can get the match list or
player list. you can right-click on the list items to access
shortcut menus. An important feature of XuanXuanGo 7.0 is you can
try playing stones while you're observng a match, right on the match
board, XuanXuanGo provides a button to remove the trial moves.
When you start a game, the program will say "Hi" to your
opponent. When you think the game should be done, press "Pass"
button, the game enters into scoring mode after your opponent
agrees, click dead stones to mark them, when all dead stones are
marked, press "Done" to end the match. During the scoring mode, you
can use "Undo" button to restart the scoring process. The program
automatically says "Thank you for the game" when your match is done.
After your match is over, you can review the game online with your
opponent, or you just review it locally. If you review online, you
can add as many branches as you will, you can chat with your
opponent, mark stones with many types of marks, etc.
Use F9 to open played-game-archive.