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Cant set Niagara Parameter in 4.26

I bought a pack from the marketplace with blood spurt niagara particles. The effects have a user parameter called BloodColor that i am trying to change in blueprints, but nothing seems to be working. what am i doing wrong? here is a link with pictures so you can see what im doing
https://answers.unrealengine.com/questions/1044382/cant-set-niagara-parameter-in-426.html