You're not being a pain. The instructions are based on editing the objects in SimPE. That's the program which you need you use to edit all the objects they are discussing. If you don't know what it is, look
here.
This is a basic cheap computer package opened.
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If you've never used it before, I suggest you find/read some tutorials before using it. There are many around, and for a lot of the objects mentioned, it's quite basic. Some others are more complicated, but look around because someone might have done them already.