To edit the existing banner

1. Go to the Magento Admin panel.
2. On the left navigation bar, click the AFFILIATE SYSTEM menu.
   The menu appears as shown in the following figure:
   
3. Click Manage Banners.
   The Manage Banner page as shown in the following figure:
   
4. Scroll down to the required banner to edit.
5. In the Action column, click the Edit link associated with the required banner.
   The Edit Banner page appears as shown in the following figure:
   
6. Make the changes as per the requirement, and then click the Save button.
   The changes are saved.