If you are one of our advanced users who wants to completely customize the code for all their MailChimp hosted signup forms and emails - you can! You'll need to know HTML in order to implement any of this. If you're not an HTML wiz, you might ask your web developer to handle this for you.
How to Access Advanced Mode
In your MailChimp account, go to Lists Tab > forms > scroll to the bottom of the form designer > click on the "Advanced Mode" link.
What can I tweak?
Almost everything. Most MailChimp List Management forms, emails, and confirmation screens can be totally customized any way you want, to match the look and feel of your website.
Just don't alter the unique Form tags, field names, and *|MERGE|* tags that we created specifically for your list:

Note
Advanced mode is available only on paid accounts.