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 "Hourly Service Quoted Defaults" Tab (RED).
Hourly Price Text (YELLOW): View the current Hourly Price Text.
Actions (BLUE): Edit verbiage by clicking the 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.