Your Nokia N73 has a certain look to its backgrounds and its icons, and the elements of this are collectively called a theme. You can change the theme of your phone both using themes already on it and others you download to it.

To see the themes available on your phone and choose a new one press the Nokia Menu key to the left of the 1 and 2 keys then choose Tools then Themes.

You will see a list of themes, and probably a tick by the side of ‘Nokia’. Use the scroll key to move to one of the others available and then choose Options with the left Selection key. Now choose Preview.

If you like the look of this theme choose Apply with the left Selection key. If not choose Back with the right selection key and preview a different theme.

When you have found the theme you like the best choose Apply with the left Selection key.