First go to this folder :
\nUI\Layouts\Default\HUDLayouts\
Then choose the Hud Layout folder you wish to change it for :
The open up the file :
nUI_HUDSkin_<HudLayout>_Target.lua
In there is a section called [casting] which sounds like the cast bar you want to change. The anchor part of that has the xOf and yOfs you want to change.
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