I have just done what prkos said: i duplicated my first circle (ctrl + d) and i blur it

if you tell me how i'll be glad to post an example

thank you a lot, I solved it

I'm new in this forum so if there's alredy a thread in which there's my question please tell me and close this one but i couldn't find it.

So this is my question:
I drew a circle but now i need to draw round it inner glow / outer shadow with a gradient like a shadow