Need help with waldo lake

It says 1oz. Cascade (first sort). Does that mean to add after I collect my first mash or after
I collect my entire wort? Or is it something else?

Meant (first wort)

Put the FWH into the kettle then lauter your runnings into the kettle.
They steep in the warm wort as the kettle fills, and you leave them in there.
Through " magic " you get smoother bitterness equal to a 20 min addition.

Thanks for the reassurance Scott, kinda what I thought but was unsure.