Hello @AjeetV ,
The default button at the top is currently linked to the legacy landing page sign up form associated with your account. There is an active feature request for this that our devs are working on, so I've assigned your case to their queue. If and when they have an update regarding this default button, they'll make sure to notify you.
In the meantime, to update this legacy form, you'll want to go to the Sign-up Forms in the navigation bar. Then go to Legacy Landing Pages, and click on the one titled Sign-Up Form. There you can select which of your lists is available for signees to sign up for, or just select a single list so all webpage signees to go to automatically.
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William A
Community & Social Media Support
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