Creating a Menu KDE 5 Launcher
You are Welcome, this Tutorial shows you Step-by-Step How to Create/Make a New KDE Plasma 5 App Launcher on the Main Menu.
An Application Launcher is a computer program that helps a user to locate and start other computer programs. An App Launcher provides shortcuts to Run computer programs, and stores the shortcuts in one place so they are easier to find.

Right-Click on KDE KickOff & Select Edit Applications.
Select a Section & Create a New Item.
And Name it as needed…
Set Command & App Icon
If Not on the System Icons then Browse into the Program folder..
Last Save the New Launcher.
New KDE 5 Menu Item.