Clickable Telephone Link

I am using Lodestar theme and I have my contact number displayed at the top of the website, by using “Theme Options” –> “Header Top Text” and then putting my contact number in the text box. By doing this, the number properly appears in the website. However, the challenge is that this is not a clickable link, due to which I am not getting calls and also having issues in my Google Search ads. Need guidance on how to make this phone number as clickable, so that it directly opens the phone dialer when people click on the phone number. Look forward to suggestions.

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