Click on the Header/Footer tab.

Edit the Header/Footer with a standard message that you want to show (optionally) on your quotes.
The Header/Footer cover all your generic information that applies to all builders, for specific notes relating to the job use the Notes field in Details tab.
You will have the opportunity of turning them on or off for each quote. 
Note that the header and footer for quotes is quite separate from the invoice header & footer. 
These are optionally available at invoice time.