It's always a good idea to make it as easy as possible for people to contact you, and helps improve the usability of your website. Adding a click-to-call link allows for visitors to your website to call you or your business directly.
To do so, follow these steps:
Select the element or text that you would like to link to a phone number
Open the linking panel (instructions on how to do so are here)
Select External Link
Type in "tel:" + the phone number using no dashes.
Hit enter on your keyboard
Once you've hit enter, you can close the dialog box and once you publish your changes, visitors will be able to call you directly via your website.