All of the creating is done in the 'build' tab.
At the top of the tab you will see several different tabs. To build a template click on the 'ad templates' tab. This will allow you to choose what each field on the template will display.
You can always add new templates by clicking on 'new ad template' at the bottom of the screen.
2) Backup templates
If you add dynamic fields to your Google AdWords templates it may occur that the maximum length of some fields is reached. For instance the maximum length of the 'Headline 1' field is 30 characters.
To circumvent this you can add 'Backup templates'. These backup templates function as a backup in case fields in primary templates exceed their maximum length. You can use backup templates to always send correct ads to Google Adwords.
When you have finished click 'save'. See the next article for creating keywords.