AI Copilot is in the side menu, under the AI Copilot item, and also inside Meta Ads. In Meta Ads, the Analyze with AI button (in the Period Summary panel) and the floating chat button open a conversation that already has the context of the account and period you're viewing. On the AI Copilot page, choose the ad account in the search field at the top and click New conversation to start from scratch, or click one of the Recent conversations to pick up where you left off. Just write what you want, as you would with a manager, for example: list my active campaigns, what should I scale today, or why did my CPA get worse this week.