How can I enable a sidebar on my page?
To enable a sidebar on your page:
Go to the page where you would like to enable the sidebar.
Click Page Options.
Click Edit Page Details.
Click Show for the Sidebar in this page option.
Click OK.
Note: At the bottom of the Page Details dialog box, you will find the Custom Side Bar option. Click Yes if you would like the sidebar content to be page-specific. Click No if you would like the sidebar content to be site-wide. Click OK to apply.