"One key and clic"?

Hello. In the tutorial of Unreal Engine ( A new, community-hosted Unreal Engine Wiki - Announcements - Epic Developer Community Forums ), he says “one key and clic” in 5:00 minute, but i already tried this and that don’t work. What should i do please?

It does work. Push and hold the “1” Key on your Keyboard and then do a left click with your mouse. However, everything he does there is creating a scalar parameter node. You can just create that Node “ScalarParameter” by your standard method you are used to place node.