Scripts can comprise of one file, which can be loaded into mIRC using the /load command. A "full script" may need to have your mIRC.exe file placed in the directory of the script files where they will take immediate affect to your copy of mIRC when you open it.
To load a file (let's say script.mrc), you can type /load -rs script.mrc. See /help /load to see what the different switches (like -rs) mean.
Scripts are loaded into the Script Editor in the Remote section. To access it, press ALT+R. You can load files from there by going to File > Load and choosing the appropriate script file. You can also go to File > New and paste or write your own code in a new remote file.
It is however not possible for us to give exact instructions for any script you download. A good script will come with documentation telling you how to load it, use it and contact the author.
Regards,
