We'd be happy to help you update your sign-up form! What kind of sign-up form are you working with? I took a look at your account and can see you have landing page being used. If you are trying to edit this landing page sign-up form under the Sign-up Forms tab of you account.
This section of your account is where you can find "Landing Pages and More" in the bottom right hand corner.
This is where you can find your already existing form, and click on its name to make edits. If you are not updating a landing page sign-up form please let us know so we can help point you in the right direction.
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