Cannot put any launcher on panel

The OS installed with minim XFCE installation
but then after doing some files operation on ~ dir., cannot put a launcher on panel.
How to fix it?
Please help out !

Do you mean by drag-and-drop or through the panel menu?

Right click on the panel-choose panel-add new items-choose launcher-click “add” on bottom
then: right click on the newly created launcher and on right side choose add a new empty item and fill in the information e.g. name, command (path to executable) etc.

Not work, no such

instead window menus e.g: minimize, mazimize, close window, etc etc

it is the second icon from the bottom on the right side.