Issues with NAMEOFF and colors (lookup)

[Anonymous]

Hello all, 

I'm a complete beginner with Power BI and inherited of Report I need to modify. I wanted to add some automated colors thanks to the lookup function. However, I am blocked by a NAMEOFF (1) function I first-able don't quiet understand and can't get around to apply my color system. 
(1) Serves the purpose to, change the appellation of categories when a button is triggered. 
(2) My miserable attempt to get around since I didn't manage to get it in the same measure(1). 

(1)

(2) 

Someone willing ti help ? 

[Greg_Deckler · Accepted solution]

@Anonymous Looks like they are using Field Parameters. You can learn about them here: Let report readers use field parameters to change visuals (preview) - Power BI | Microsoft Learn