Hello @AmandaH72 ,
You can either set up select-able options in your coded forms (inline, pop-up, banner, or flyout), or you can urge your contacts to use the Update Profile functionality in email footers.
For instructions on creating coded forms:
editing an Inline form
editing a Pop-up form
editing a Flyout form
editing a Banner form
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Using the Update Profile system, you can include this as an alternative link in your email footer, which contacts can select to update their list membership, based on the lists you make viewable and editable. If multiple list options are available in your UP form, those options will also appear on the unsubscription confirmation page, as an alternative for contacts that click the unsub link in the footer.
Remember that not all lists need to be included in the UP setup. Contacts will only be able to manipulate their list membership for the ones you've explicitly selected to be available, viewable options.
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