I want to have the character two hand the weapon by connecting the two sockets on the player skeletal mesh to the two sockets on the weapon. I only know how to have them hold the weapon via just adding it to 1 socket. How can I accomplish having the player hold the weapon in both hands.
You need a base blend space that uses a default pose similar to an Aim offset. From there you attach the the object to the right hand socket (offset as needed), then use FABRIK in the animation class (animgraph) to set the left hand.