If you want to add a Trash can to your KDE Desktop  follow these steps:

Create a text file on your Desktop by right-clicking on it and select Create New > Text File.

Open this file and paste the following in the file:

    [Desktop Entry]

    Comment=Contains removed files

    EmptyIcon=trashcan_empty

    Encoding=UTF-8

    Icon=trashcan_full

    Name=Trash

    Type=Link

    URL=trash:/

Save the file and close it.

You’re done!

wasn't that easy?...