On the "Sync with MailChimp" dialog, click "Options..." to change options for syncing with your list. (It might say "Select..." on older versions.)
![](/tntmpd/cfs-filesystemfile.ashx/__key/CommunityServer.Components.ImageFileViewer/CommunityServer.Wikis.Components.Files.en/1563.mail-chimp-options.png_2D00_550x0.png)
Then click "Next" and you'll see this:
![](/tntmpd/cfs-filesystemfile.ashx/__key/CommunityServer.Components.ImageFileViewer/CommunityServer.Wikis.Components.Files.en/3107.mail-chimp-options-1.png_2D00_550x0.png)
Click "Next" again:
![](/tntmpd/cfs-filesystemfile.ashx/__key/CommunityServer.Components.ImageFileViewer/CommunityServer.Wikis.Components.Files.en/0003.mail-chimp-options-2.png_2D00_550x0.png)
Here you can select which fields you want to sync with MailChimp.