How do I access this parameter in BP?

[Jan_Reuser]

I have this Particle System component and I’m trying to access this parameter thru blueprint
However, I can’t figure out how to do it. Any Ideas?

[Jan_Reuser]

that’s it thank you !

[Shadowriver]

Those sets parameter in particle system asset, same as in materials there function to do it:

http://docs-origin.unrealengine.com/latest/INT/BlueprintAPI/Effects/Components/ParticleSystem/SetActorParameter/index.html