The install process should be straightforward after you have downloaded the image.
To Update Applications:
Open GNOME Terminal and type pkcon get-updates. Press the “ENTER” key and let the program operate the updates, or use the Package Updater GUI.
To Install New Applications:
Find the Linux Compatible software you would like to install’s website and download page. To install the .rpm file or use direct install, follow the instructions provided for OpenSUSE. They should work properly for Modern X. If a .rpm file is not provided, or there are no install instructions then it is most likely not compatible with Modern X.