By default, the GoogleSites Sidebar contains links to the pages you have created in your GoogleSite. If you click on Edit Sidebar, you have various options for customizing how the sidebar is displayed. You will find the Edit Sidebar link down at the bottom of your Sidebar (if you do not see that, it means you are probably not logged on to your Google account; log on, and then you will see the link):
Sidebar Width and Position. You can change the width and/or the position of the sidebar by clicking on Change Site Layout.
After you click on Change Site Layout, you will see a variety of options. You even have the option to hide the sidebar if you want by clicking on "No sidebar."
When you are done making changes to the size and position of the Sidebar, make sure you click OK to save your changes. This will close the Site Layout dialog window.
Sidebar Navigation. By default, navigation links to the pages in your site are included in the Sidebar. To change the ORDER of the links, un-check the box that says "Automatically organize my navigation."
Customize the Navigation. When you un-check the automatic navigation box, you will see a list of pages pop up, with up and down arrows to let you organize the order in which they are listed. There is also an "X" which lets you delete an item from the navigation listing. The left and right arrows allow you to indent the pages to create something like a Table of Contents with sections and subsections.
You cannot change the name of a page here, but you can get around that by using the Add URL option; just add the URL of your GoogleSite page with the Text you want to display.
After you click OK, you will see the Text that you added in the list of pages, which you can move up and down just like the other pages in your site.
Add Text to the Sidebar. You can add additional text to your Sidebar. To add a text box, click on Add a Sidebar Item, a scrolling menu will come up; choose Text as the option.
After you choose Text, a Text Box will appear; to add context to the Text Box, click Edit:
You will then see the Text Box Editor which allows you to include formatted text and links.
Although it does not have an image icon to make it easy to add images, you can do that by remote linking to an image. Just click on the HTML edit button, and then enter the image tag directly, using IMG SRC.
(To do this, you will need to understand the basics of HTML code.)
SAVE CHANGES. If you have made changes, don't forget to click on Save Changes at the top (or bottom) of the page when you are done. You can then click on Return To Site to see how the changes look.