Steps :-
1. Login to your Blogger account control panel. Select the "Design" tab at the top, and then select the "Add a Gadget" option.
1. Login to your Blogger account control panel. Select the "Design" tab at the top, and then select the "Add a Gadget" option.
2. In the pop up window that appears, locate the "HTML/JavaScript" option and click the "+" button next to it
3.Give your gadget a title (if you want), and copy the whos.amung.us widget code into the "Content" section of the gadget. Then press the "Save" button.
4. Now click the "Save button" at the top of the page to save your settings. The widget is now installed on your blog!
ex. see my blog left side or below