Mailster forms can be defined and customized via the forms page. You can add additional content via some coding by using the mailster_form filter hook.
Adding Content to your Forms
Read More →
Articles Tagged: forms
How to redirect after form submission?
By default Mailster forms are ajax based and you get a nice confirmation message after your users have submitted the form. If you like to redirect them to a specific page you can find this option in the form settings.