How do I set a component via blueprint (variable) ?

Hello everyone !

Today a simple question like the title say :
How can I change propertie of a component in my blueprint ?

By example, I would like to change the field of view of my camera when my pawn move forward (depend on speed) . For that I would like to call “field of view” as a variable in my blueprint .
Should be easy but I suck on it . In the picture the “SET Field Of View” is just a float variable that I create but its not yet the propertie of the camera . Thanks a lot !

Resolved sorry question already post !