How to use socket

Hi, I am new to UE4, I want to make my character to holding a gun using socket. I watch many tutorials and read it on the document. But I still failed. I don’t really know how to blueprinting. And whenever I tried those tutorials, none of them work. I mean, I want to know how to use socket. Pls help me,
(Maybe this is a stupid question, but pls answer me if you know :frowning: )
Thx,

I am using UE4.13

and Blueprints not C++

—TheUnknown919