How to Create a Custom Unsubscribe Page
Then you can take that form and embed it on any web page and then in your email campaign where you would normally put the unsubscribe link you instead can link to the new page with the unsubscribe form.
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How to Remove or Change the Email Marketing by Interspire in Web Forms
“Email Marketing by Interspire” in which the words Email Marketing are hyperlinked back to Interspire’s website. I can’t imagine why you would buy a license from Interspire and then do them a favor by linking back to their site everywhere that you put a web optin form.