Hello Adrian,
The ability to change the color schemes in the Applications Manager client GUI was removed with the release of AM version 8. Before version 8's release, color schemes of the GUI could be changed by changing the variable "LookandFeel=" which resided in the client.jnlp file. Currently, there is no way to change the background or color scheme for the UI.
The instructions in the AppMaster Administration is referring to specific feature changes available to AppMaster, which is an add-on available to Applications Manager. AppMaster allows you to view multiple automation engines(environments) from its interface and does not relate to the Applications Manager Client GUI.
I recommend filling out an enhancement request to have this feature added to a future release of Applications Manager. An enhancement request can be entered in by visiting
http://ideas.automic.com.Much Regards,
Phearith Mao