Really it depends on what the "software" actually is.
If it's HTML or PHP, then you should be able to do it yourself with an editor.
If it's Visual Basic, C#, or other .net stuff, then you probably need a programmer who can "compile" the changed code for you.
I didn't purchase SourceCodeGoldmine, so I don't know what's included to be able to give you a more informed answer, sorry.