How can I find the "motioncontroller" node to call out teleportation function in UE 2.7?

When I was following the online tutorial: Creating Virtual Reality Walkthrough
and trying to use my motion controller to teleport, I can’t find the node for the “motion controller” blueprint.
Then I tried to reset my input for my Vive trigger and call out it in blue print but still not working?
Please can somebody teach me how to enable interactions for HTC Vive motion controllers?

Thanks so much for helping