1. Log into the administration dashboard of your site that is running the Thesis theme.
2. Click on 'Plugins' on the sidebar and then click on the 'Install Plugins' tab. In the search box, type 'Thesis OpenHook' and click 'Search.' Click on 'Install' when it appears on the screen to install it to your site.
3. Click on 'Activate' to activate this plugin once you have it installed. When you do this, you will see it appear under the 'Appearance' menu on the sidebar. Click on it from there to see your editing options.
4. Scroll down the page until you see the 'Footer' heading followed by a large text box.
5. Enter in your custom footer in the text box by 'Footer' and click on the save button when you are done. This replaces your footer with the new customized footer.