Here is a detailed explanation I have given last year to another user. It is about how to modify the default list of Flooring Types in Zones:
However, you will also find the the default list of Zones Names as well in the Master Script of that zone macro, so you can modify them in a similar fashion as described in the thread.
That being said, it is now possible to display Properties in the Zone Stamp. So, you could actually create a new Property for Zones and provide an Option List for it with all the Zone Names you want to define.
Then, in the Zone Stamp, you should display "Classification and Properties" as the first item in the Zone Stamp instead of Zone Name, and set that Property to be displayed in the first place.
Then, you would not need to modify the GDL Script of Zone Stamps.
It is all as explained in my previous post.
If you have an LCF (Library Container File) for your library, you will need to extract it first and the load that extracted library so you can access the individual objects.
I am pretty sure the default library is a container file.
If it is not then forget I even mentioned container files.
Then follow the instructions in my previous post.
CTRL+SHIFT+O Is the lazy way to open the files.
Just select the object (or the macro name in a script) and CTRL+SHIFT+O.
Otherwise you have to use the open library part command and browse for the files, so you will need to know where they are saved.