Changing your wallpaper or screen saver:
Start -> Control Panel -> Appearance and Personalization
The first section called Personalization would be the only one you would actually need to use to change the wallpaper or screen saver
Add or change a signature
You can put up to 10,000 characters in your signature.
- Open Gmail.
- In the top right, click Settings Settings.
- In the "Signature" section, add your signature text in the box. If you want, you can format your message by adding an image or changing the text style.
- At the bottom of the page, click Save Changes.