First you need to have installed Diamond TF3D Config installed on your phone. Second step is to download the theme you want and save it to the following location "Internal Storage\Themes\", if this folder is not available you should create it for yourself. Run the Diamond TF3D Config and go to its second tab called Appearance. At the top you should view dropdown box, from which you can select the theme you've previously copied. Next steps are to click on Apply button after which you will be shown a new screen with Start button on it. Just tap it and wait few minutes to have the theme correctly installed.

Below are screenshots showing the process:

How to change the TouchFLO 3D theme

How to change the TouchFLO 3D theme

How to change the TouchFLO 3D theme

How to change the TouchFLO 3D theme


To remove the installed theme go to the Appearance tab again and run the Restore Default action.

Take a look at the video below to see in action how i installed the Zitoun DirtyPaper theme on my Diamond.