Help me calculate resistors for bipolar PSU

Hello Folks,

I've got a PSU design which is supposed to deliver ±15V from a dual 18V AC wall wart.
For my purposes I need ±12V and the designer told me that I can change resistors in order to get my desired voltages.
However I'm a bit clueless how. Maybe some of you electronic wizzards can help me out.. please find attached the schematics of the PSU.
And here are both the used voltage regulator transistors:

LM317L
https://www.ti.com/lit/ds/symlink/lm317l.pdf?ts=1613021016498&ref_url=https%253A%252F%252Fwww.google.com%252F

LM337L
https://www.ti.com/lit/ds/symlink/lm337l.pdf?ts=1613060012481&ref_url=https%253A%252F%252Fwww.google.com%252F



Thanks in advance
 

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