Can I add your installation code through a Wordpress text widget?
Unfortunately no. The installation code must be added directly to the source code of your sidebar of footer file in Wordpress. The code cannot be added through a text widget or executable widget.
Please follow the instructions closely under the installation code button in your Control Panel. By selecting the option for Wordpress blog under step 1 you will be provided with a link to specific instructions. Note:
Add the following code into Sidebar template of your WordPress theme (WordPress Admin->Presentation->Theme editor->/Sidebar/).
Thus the code must be added directly to the source code and not through a text widget.
You can view this article online at:
http://www.authoritybacklinks.com/faq/index.php/article/wordpress-text-widget