There are 2 ways to add a call now button to your website: by adding a line of JavaScript to your website or via the Call Now Button WordPress plugin. The WordPress plugin will be the easiest way for adding a single button and if you want to add more buttons you can create an account and add the API key to give your plugin super powers. If your website is not on WordPress you should create a (free) account on callnowbutton.com and copy a single line of JavaScript to your website. That's it.