Change the NYSE To Other Stock Exchange?

Hi There
I’m trying to build a sheet in numbers to track my stocks but I’m faced with a problem.
The built-in sheet in numbers where one can easily track stocks, it’s based on the NYSE.
I live in Johannesburg South Africa and want to track my stocks on the JSE here in South Africa
My question is, where can I change the stock exchange from NYSE to JSE?
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Alex