Complimentary Flight - Amex Velocity Platinum - partner ticket?

[chaosboi]

I’ve just been approved an Amex Velocity Platinum card and was reading about the complimentary flight per year and have a question.

When you book the complimentary flight via the booking page can you add an extra paid ticket for partner/friends etc? Or do you have to make a seperate booking via the normal website for the same flight?