How do you edit this niagara parameter?

so i bought this vfx asset from the market place and in the niagara system graph there is this one parameter for particle lifetime that I can’t edit or change why is that? I am only used to editing niagara particles from the node but don’t know if there is some parent or other forms of variables to set these parameters

Here is the pic

Hi, this is built in variable. If you select the emitter, you will have it listed in Parameters window, in Particle Attributes section:

To adjust the lifetime simply use Initialize Particle module from Particle Spawn section:

If you want to have a single value instead of random, just change it to Direct Set.

How it works: Initialize Module just calculates this value and sets in that variable called Lifetime: