Its not really for me to talk as am a total noob but this is what i think is meant.
Yes this should go into the remotes. I tries this script myself and it works perfectly. as russel suggested you need to make a txt file called channels and what i think you need to do is place that into your mIRC directory and then restart mIRC and connect.
You have to be patient as it joins the first channel in 60 seconds from the connect time.
as he mentioned if thats too slow adjust the 60 to something less, when you connect you can type /timers to see if the timers activated.