The organization logo is displayed at the upper-left corner of AEM Forms workspace. To update the logo, follow the Generic steps of AEM Forms workspace customization and then the following steps.
Create a logo and name the file as NewWorkspace.png. Place the image file in /apps/ws/images folder using a WebDAV client.
The recommended size of the logo image is 218 px × 20 px.
For more information about WebDAV access, see http://dev.day.com/docs/en/crx/current/how_to/webdav_access.html.