Make screen effect with BP

Hello guys, i need to make Visual screen effect, that all screen is blured, so as i understand i need to use for this Post Processing. But what if i need not only certain area, but everywhere. For example player put ‘E’ key and Post Processing works.
I’m understand about PP Volumes, but not found information about how to do that with BP, please help

So i created BluePrint with Post Process Component inside calles “Post Process 1”
On picture is event graph.

Can’t you use post process depth of field for that?

Hello! The main question is how to change my post process values through BluePrint. So i want to on/off Post Process after putting button, in fact i just need to change some values between 0 and 1, can’t you help me with bp setup ?

any help ?