Two Bone IK

How I can do a two bone IK to make my character able to hold a weapon? In UE4 Docs there is a video where its shown exactly what I want to do but there is not explanation. I’m making this thread hoping someone knows how to do that.

Here’s the link to UE4 Docs: Animation Blueprint Two Bone IK in Unreal Engine | Unreal Engine 5.1 Documentation