Can’t Edit Top of Page

I just recently took over managing our site from an outside marketing company.
I have searched all over the admin panel and in plugins to try to find where I can edit the top of the page above the nav bar and I can’t figure it out. I want to change the phone number listed at the top of our page to be a clickable link to make calling easier.

The only code I can find referencing it is this in the style sheet:

#header-call-today {
position: absolute;
right: 20px;
top: 100px;
font: 18px/18px ‘OswaldLight’, sans-serif;
}
#header-call-today span {
color: #454352;
font-size: 2.25em;
font-weight: bold;
line-height: 32px;
filter: Shadow(Color=#f1c833,Direction=0, Strength=6);
text-shadow: #f1c833 0px 0px 6px;
}

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