Well if you installed SCAR, all you have to do to get scripts on it is to download what ever script you want and it should be a .scar file. double click the file and it should come up on SCAR.
If which ever script you want isn't available for download and the scripter just gives the source of the script then copy and paste that into notepad then click save as, all files, then save it as anything you want .scar, and double click that file.
Sorry that i cant make a vid of it I'm lazy. tell me if that helped.