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.
If you have created a form from another source, unfortunately it would not be possible to import it to JotForm. You will need to create JotForm's form builder to create your form.
But if what you want is to embed your form to your landing page, you can do so by editing your form and clicking Publish on top. You will have a list of options on the left panel.
Click on Embed where you will get a list of embed methods to choose from
However if this is not what you mean, it would be great if you can provide us more information.