Clickable Telephone Number Link

I know how to create the link, I just do not know how to enter the code in this theme. I would like to make this number (818) 990-0999 found above the text, ” Enroll Now”, clickable to dial the number on a mobile device.
I have the code, ” , I just do not know how to access the template to see the html to add it. Any help would be greatly appreciated.

Thank you in advance.

The page I need help with: [log in to see the link]