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.
You can try editing the "Title" and the "Page" text in your form's preferences:
You can also use the "Share Form" button under the "Publish" wizard.
However, unfortunately, it is not possible to edit the text description "Please click this link to complete this form".
You might also check this guide and see if it helps: http://www.cnet.com/how-to/how-to-share-a-link-on-facebook-without-sharing-the-actual-url/
You can also use 3rd party link generators to make a custom link with custom titles on them, here are some that I found:
I hope that helps.