The video below shows the process of How to Replace the Text in a Sidebar (click the button on the bottom right of the video to expand the view). You can also follow the screen shots and steps below this.
2) Click on the 'Sidebars' link on the left hand menu.
3) A list of your sidebars is displayed. Click on the title of the sidebar you wish to edit.
4) Press the Find and Replace button
5) Complete the text you want to replace and the new text and click on the Replace button. If you want to replace all the same text on that particular sidebar, then click on Replace All button.
6) You will see the text has been replaced. Now click on Save Changes button to save the changes.