pjromdev said it pretty accurately.
It really depends on what they are getting you to do, if you have never done programming then editing scriplets could be problematic. That being said it depends on how you define editing.
If they are having you copy and past a chunk of code into the site and it should work as it, you'll be fine. The same also goes if you are just editing a few parameters in that chunk of code. For example if something is like :
String databaseName = "Happy_Feet";
And all your doing is changing the Happy_Feet portion, it won't be an issue. Just remember only change exactly what you are told to change.