Calendly Module Options
Within the module, just enter your Calendly username, adjust some text and colors, and you're all set. You can choose between an inline integration or a simple text link.
Use the Customizer
Visit the WordPress customizer and you'll see an option for Calendly. This will allow you to have a pop-up box on the bottom right of your screen where users can quickly schedule appointments with you.
You can visit my friend's Mediation Consultation page to see how embedded inline works. It's pretty nifty. Here's a screengrab of the result.