If a scripter posts a script useful for you, ask copy the script(as text), then while you are in the RMXP editor, press F11(for the Script Editor) then find the tab "Main". Right click on it, then click INSERT. A blank space will appear. On the large space on the left, paste the script. And rename the script via the lowest type box on the right.
(didnt you read the Help file of the program?)