You do not need to have Universal Email installed. Universal Email is included as part of form builder.
you will not be able to edit the universal email settings in the form builder wizard after you have already created the form.
to edit the universal email settings go to the server behaviors panel and double click the universal email server behavior.
there are a number of things that cause the email not to send correctly.
Who is your host? in a lot of cases, you can leave the SMTP Server setting blank, but some hosts will require that you enter it.
What have you entered for the from address? many hosts will require that the from address be a valid email address for your domain.
On the SMTP Server settings tab, there is an option to "Include the From address as an extra parameter" depending on your host, you may need to check this.