Oh right. :)
I'm still learning the language so I'm only doing basic things with it at the moment.
First thing is opening the Script Editor found in the Tools Tab, or you can click the quick icon placed just left of the Music Player.
Once you have that open it might be a good idea to have a look at all the names down the left menu and maybe click on them to see their code so you get a slight idea of what each script is for.
Even if you don't have a clue what any of the code means it can sometimes be good to read through some of it because some parts of the script may have an obvious name that would let you know what it does.
If you change any code in the Script Editor its always a good idea to save a copy of the old code in a text file so you have a back-up incase you mess up and make something not run anymore.
I always have
this site open when i'm doing anything with RGSS, on the left of that page is a Syntax and Classes list. (If you click on any of the words/characters inside those areas you'll get a description of what it does and in some cases an example code.
Since i'm still learning thats really all I know how to explain so far, when I started playing around with the code I began with just changing values in purple and red.
Be sure to keep a copy of the original code in case you stop something from working.
Also if you do look through and change code, if your not sure about things then its usually best to change bits little by little so you don't change a lot, find and error and then have to either change it all back or look through it all for the problem.
Usually if you get a code error it will look a little like the one that a_d00d posted in my code fix topic (in his quote).