I have installed MakeDVD, but I cannot find it in PowerCinema.

To install MakeDVD in PowerCinema, PowerCinema 4.00.1723 or higher version is required. Please check the version number of your PowerCinema in "Settings" => "About PowerCinema". If your PowerCinema version is lower, then you will have to upgrade or use MakeDVD as a standalone application, which will work equally fine.