To add any widget to your website please follow steps. 

01. login to your admin panel 
02. click on general and go to widget from menu 
03. click on Add in order to add a new widget
04. type or paste your HTML code 
05. click on Add from bottom of the page
06. now it will take you back to widgets listing page where you can see your widgets code in following format:

<?php echo run_widget(<any integer number>); ?>

07. copy your widget code and paste into any page by editing 

that's all.