The DFP Small Business tag generator can automatically generate the HTML and JavaScript necessary to integrate one or more ad units on a page. Using the ad tag generator is optional, but generally easier and less error-prone than manually rewriting code.
To generate tags for one or more ad units:
In your DFP Small Business account, click the Inventory tab.
Click Generate tags on the left-hand panel.
Select ad units by clicking include next to the appropriate ad unit names. (You can generate tags for all ad units at once or page by page.)
Click Generate tags. A text field with the full HTML for the page, including the selected ad units, will appear.
Copy the code and send it to your webmaster, who will place it in the HTML of the appropriate pages.