How do I add sites to the network? (.Com's)

I cannot add sites to my network. Yes the network is set up properly.

I just don’t get it. It cannot be this hard. What is wrong with me?

There are TONS of videos here. But none that address this problem. I am not here to get videos so I can white-label them and teach people.

I am here to learn how to set up and run a WPMU network. And the are zero videos on that?


Thank you.