e-goi Mail List Builder is a simple plugin to integrate e-goi API with WordPress and manage your newsletter subscribers list!
Yes you can, everything can be changed except for the colors.
Just click on the link available at the info screen, register an account, and get your API key!
= Can I add a subscribe checkbox to the comment section?
Yes, just activate it in the Settings page.
You can create and update your lists, see how many subscribers you have, but you can not delete them.