How to attach blueprints?

i am trying to attach two blueprints together in vr mode in unreal engine, i want it to be like a Lego piece, attach and remove, but i dont know how to make the object pick able and to attach it to component, please help fast

YT is your friend:

https://www.youtube.com/results?search_query=ue4+vr+pick+up+object

Attaching things is usually done via Attach To Actor / Component nodes.