What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
I'm not sure if I understand you correctly, but when you said "always sending email to default address" then I guess you're talking about email notifications.
You will receive an email when someone completed your form. It will be sent on the recipient email. By default all forms send emails to your account email address. You can changed it by changing the recipient email on the notification wizard.
Here are some guides that might help you.
Hope this helps. Thank you.
What about the Sender, it will change to whoever fill the form?
Or just stay at default firstname.lastname@example.org?
The senders name can be chosen from the dropdown list by choosing the name field. The Reply-to Email can be filled with sender's email field.
Sender's email can be the one chosen from the list or you may add your email address to the list. Please check the following guide to add your email address to the Sender's email list.
Your other questions are moved to new threads and shall be addressed separately.
Let us know if you need further assistance. Thanks!!