In short: New Campaign, then Build Brief.
The builder is the hands-on route. It asks for one thing at a time and pulls the options from your Brand DNA, so you are choosing rather than typing.
Pick the product
Comes straight from your Brand DNA, so the campaign is anchored to something real. Both the product and the audience questions have a second tab, Custom description and Custom persona, for briefing something that is not in your library yet. What you type there belongs to this campaign only.
Pick the persona
This is the choice that most changes the tone of what comes back.
Set the objective
Awareness, consideration or conversion. It shifts the whole shape of the copy.
Add anything it cannot know
Timing, offers, constraints, a competitor move. Your context beats its inference.
If a section is missing options, that usually means the matching part of Brand DNA is thin, and filling that in helps every future campaign too.
