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How i upload flat-ui-themeon on my ERPNEXT v12?

how i add Theme Ui on ERPNEXT V12. i dont know to upload ?
the link is flat-ui-theme-for-erpnext-v12/53524
https://github.com/hashirluv/bluetheme
my ERPNEXT production (image) on vmMachine…

i need the way to upload the flat-ui-theme to my eprnext…thanks