I saw black background on settings page, how can I've same ?
About messages, it's possible to change the green background of owner's messages ? It's difficult to read white on green, isn'it ?
Did you mean the dark theme? If so, download the UT Tweak Tool app from the Openstore, (If you haven't already got it) and on the App/Scope page, near the bottom, there's a System Theme button which takes you to options.
Regarding green text boxes, as far as I know we can't change the colour. Sorry