Main Menu Script Issue

Hi,
My name is siddharth and I am new to the unreal engine blueprint visual scripting.I am following the Unreal engine documents to create a main menu.
following is the link of the page
https://docs.unrealengine.com/latest/INT/Engine/UMG/QuickStart/4/index.html

I am stuck in between the process.I didn’t understand the 17th Step of the “4.Scripting the Main menu” Page

Which is “17.Following the Event Begin Play script, add a Get Player Controller then Set Input Mode Game Only node.”
I have attached the image please check.I am not able to locate one of the node.I have marked the node in the image.

Please help me

Hi!

This variable was created in begin of this tutorial

Thank you so much for the reply it solved my issue.