How do i call a custom event funtion?

I’m following this tutorial:

At about the ten minute mark I am told to create a custom event, which I can do; however, immediately after I am told to call the custom event function and connect it to the first sequence pin. When I try to call the function, the function does not exist even though I have the option checked off to call the event in the editor.

How can I accomplish what is being done in the video?

I am using the 4.6.1 version of the engine.

Thanks