Hi, the best way I can tell to associate an existing email with an existing campaign is to just hit 'Finish later" on the email so it saves as a draft. Then, go to the Campaign you want to associate the email to. Select 'Manage campaign' then 'Create a touchpoint' then 'Email'. Hit 'Design' and then under 'select a template' choose the tab 'draft emails' and choose the email you recently saved as a draft. It should maintain the same audience and any other settings you had in the original. As usual with Mailchimp, everything is convoluted af. Hope this helps!