Create a new banner
When you start Banner Effect, the first thing to do is create a new banner. To do this, simply click the first icon in the toolbar (1). (you can also use the File/New... menu).
A window will open. You can choose from several predefined formats (Google Adwords) or, if you click the second tab (2) (Custom Format) you can enter the exact dimensions of your banner.
Then click the Create new banner button (3) to create the banner.
You can change at any time the size of your banner using the Project/Settings... menu