Sounds like you're confusing a few things.
The buff immunity timer window is accessed via the FetishCentral menu. It is set to Jester's Cap by default and produces immunity progress bars for up to 5 people currently with immunity. Once you have a rotation rolling, you can even recast from this window when immunity expires on a person.
Note: Letting immunity expire on more than 1 person before recasting can result in a person getting dropped from the immunity window, requiring you to cast on them via other means.
The Buffimmunity window is completely separate from ClickAbilities, which is used for casting across Raid and Group via buttons in the raid and group windows. Enabling the titlebar in these windows should reveal a small "S" button. Click that to bring up the "On-the-fly" settings window.
The sets you find in that window can be permanently changed out-of-game via the exe found in UI/FetishNightfall/Plugins
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