As a bulb user with a free account, you are allowed ten shared pages. If you want to share a new page, but already have ten, you can un-share a previous page.
Un-sharing a page
1. Open the share panel within the page you would like to un-share.
2. Click the small x icon next to the group or share setting you would like to remove. This will cause that option to become grayed out and crossed out. Once you have done that, click the APPLY SHARE SETTINGS button. Now, your page is un-shared.
*the red exclamation point icon means your page is un-shared
Short video on un-sharing a page: