Hello @StephanieC765 ,
Have you setup a coded sign-up form to have multiple list options to allow subscribers to select which author they want to sign up for?
editing an Inline form
editing a Pop-up form
editing a Flyout form
editing a Banner form
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If you're referencing a lead generation landing page form, only one list can currently be assigned to it, so you'd need to have separate landing pages (and subsequently links) for each author's list.
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If this is regarding the sign up button at the top of emails' webpage versions this is by default linked to the legacy landing page form available on your sign up forms page. This older landing page can have multiple list selections so signees can choose which author's list they want to sign up for.
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