If you have a website in GoDaddy and you want to add a WhatsApp button with page scrolling, the best way is to use our Addons, plugins or modules.
If you have a WordPress Website, this is the plugin you need to add in GoDaddy to have WhatsApp Chat:
If you have Drupal, Joomla as CMS installed in GoDaddy, you need to add this free WhatsApp Widget.
If you are using GoDaddy internal tool to create a website, you can create your own script and paste it in the website. It is free for your first domain.