You will find your ad creative templates in the left hand sidebar in the ‘Create Ad’s tab and your targeting templates in the left hand sidebar in the ‘Set targeting’ tab. If you save your ad creative and your targeting work as templates you will be able to reuse successful concepts and edit your work.
In order to edit your template double click (or right click) on the template to open it and start doing your changes. When you are done you can either click ‘Save as’ if you want to save it as a new template or just click ‘Save’ if you want to overwrite the old one and save the template in the same name.
Click ‘Use’ if you want to use the template for the ads you’re about to publish.