How to create colour for new material in UE5? (Following video)

I am having trouble with following the guided tour video (first time using UE5) found here:

He creates a custom emissive material and creates a new colour to link to the material in the graph. However he does not say how it is created and just uses a short cut (which I obviously don’t know or see):

How is this done?

That node is called a Consent 3 Vector. The shortcut is holding the “3” key + left click.

In addition to the previous post:

image
image