How to change the GMT times on a Phosphor Touch Time?

Hi everyone, I'm reaching out into the community here to see if anyone can point me in the right direction to figure out how you can change the 3 time zones on the GMT function of my Phosphor Touch Time watch.

I recently picked this up in near mint condition, and its a really fun watch to have, but it seems to have three world time zones on it, that I just can't figure out how you change. Everything else is pretty easy to set. Is there anyone out there who knows how you do that, please. If so, please do drop me a line, thanks everyone!

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