Desktop shortcuts are ".desktop" files in your /home/user/Desktop directory, which are small text files describing what to run and where. I don't have KDE desktop environment, but there is some way to create a new shortcut, maybe by opening /home/user/Desktop in the GUI file browser and rightclicking empty space/checking menu options for "create link to application" and pointing it to your shell script. Or maybe you can right-click on the desktop directly, but presumably you've tried that and it doesn't work. Worst case, you can write your own forge_installer.desktop file from scratch, specifying the shell script and the working path (if needed). Ask AI how, they are actually good at getting the format correct for stuff like that.