To adjust the text that appears at the very bottom of each estimate, you will go to Manage > Estimate Settings > Main Estimate Settings.
Once in the Estimate settings you will go to the "Guaranteed Quote Service Quoted Defaults" Tab.
Guaranteed Price Text (RED): You can view the current Hourly Price Text here.
Pencil Icon (YELLOW): You are able to edit the verbiage in this section by selecting the Yellow Pencil Icon.
You can edit the verbiage and formatting in the GREEN section, and the BLUE section shows you all of the possible short codes you can use.
Don't forget to click "Update". :)