If you do not know how to load LISP scripts in Autocad there are several ways.
A) Drag n Drop the script (.lsp, .fas etc) on your drawing
B) press the command “APPLOAD” and find the script and load it.
*If you want the script to be loaded every time AutoCAD starts automatically,follow these steps.
and then press the button named Contents under the Suite icon (of Startup Suite).
Then press ADD to add your script.
Then close and again close.
The next time AutoCAD will start the script is going to be loaded automatically.