Can't find how to modify widget

I am trying to change the phone number in the upper right hand corner of my website. A previous developer created this for me. The phone number is a text widget. I cannot lot for the life of me figure out how she got that text widget to appear in the upper left hand corner of the home page.

It is definitely not on the widgets page. Where else would I look?

Charles

My site: http://www.markhamandompany.com