The enpt_enmapboxapp GUI can be found in
Use the GUI to parameterize EnPT according to your input dataset and the desired processing settings. The input parameters are explained here.
If your QGIS is not installed into a Conda Python environment but installed as a standalone software, make sure, that the Conda root directory is correctly set before you start the processing chain. It should point to the Conda installation containing the previously installed enpt Python environment.
The status of computation can be watched in the log tab and the QGIS Python console.