Thank you for taking the time to let us know. I understand you would like to add back an accidentally unsubscribed contact. If the contact wants to be on your list again, you can ask them to resubscribe by using your sign up form. You can find your sign up form if you go to "Contacts" in your Constant Contact account. Then click on "Sign Up Tools". On the right of your sign up form, you should have an "Actions" button. Choose Form Url and you can copy and paste the link in an email to them. The contact needs to fill out the form once done, they will get an email asking them to confirm they want to be resubscribed. Once they click on the link in the email they will be added back to your email list.
I truly hope this helps,
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