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I am getting errors

Yeah, that's because you should use the NEW version of this plugin which is much better. This plugin has been re-released under a different name: Newsletter Sign-Up

Why does the checkbox not show up?

You're theme probably does not support the comment hook this plugin uses. You can add it manually by adding . <?php do_action('comment_form',$post->ID); ?>

Where can I get the form action of my sign-up form?

Look at the source code of your sign-up form and check for <form action="http://www.yourmailinglist.com/signup?a=asd128".... The action url is what you need to configure in the admin panel.

Where can I get the email identifier of my sign-up form?

If you're using MailChimp or YMLP all you have to do is select your newsletter service from the dropdown. When using some other service, select other and look at the source code of your sign-up form. Look for the input field that holds the e-mailadress. The name attribute is what you need here. Want your newsletter service to appear in the drop down? Let me know and i'll add!

Your checkbox stopped working with Aweber

I did change something in version 1.7 that caused that, sorry. All you have to do is hit the submit button with the right settings once again.

For more questions and answers go and have a look at Qoate.com