To modify an existing asset, select the desired asset in the Assets List and press the Edit button located at the top of the list. All asset types have a "Name" and "File" field as shown below.
The "File" must be relative to the "Atlantis\ui" directory. To make selecting files more convenient, use the Resource Browser which can be accessed by pressing the " " button to the right of the "File" field.
The Resource Browser lists all available images in the currently loaded custom UI as well as those images that are included by Mythic. If you would like to use an image that is not in the list, press the Import button to copy a BMP or TGA image file into your custom UI directory.
To add an asset, press the Add button located at the top of the Assets List. Select the type of asset you wish to create and press OK.
To remove an asset, select the desired asset in the Assets List and press the Delete button. Alternatively, you can delete an asset by selecting the asset and pressing the "DEL" key.