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.
Type the messages instead of pasting it from a MS Word file then style it using the existing tools from the window. It reverts back to the old message probably because you've pasted an unsupported formatting to the settings. Also, make sure to hit "Finish" button from the window and "save" button from the form builder.
If still no changes visible, I would suggest clearing your forms cache: How to Clear your Form Cache and test it using the form direct URL.