How to change submission warning

I would like to change the error message to have a rather lengthy explanation for users when they try to submit a form with the same email address.

I am running into these issues:

1) The field doesn't seem to accept any HTML so paragraph tags don't work.

2) The font size is rather large.

I am guessing this can be fixed using CSS, but I don't have any CSS experience.  Can you help me figure out what code to use and where to put it?

Thank you.

You need to find the warning message "Sorry! Only one entry is allowed.  Multiple submissions are disabled for this form." and change it to required text. Please check the screenshot below:

Inside of my demo form http://form.jotformpro.com/form/51525457835966  I added this text:

The deadline for the Master Leaders applications was July 15, 2015.

And now warning looks like this.

Unfortunately the font can not be changed.

Hope this will help. Let us know if you need further assistance. 

Yes, I found where to make the change and have already done so.  My question was about formatting.  I now understand it is not possible to change the font size.  Is it possible to have the text appear in paragraph format?  My preferred text contains many sentences.

Unfortunately, the formatting of the error message cannot be changed.  The formatting of form warnings is currently fixed.  The warnings are intended for short messages regarding why the form is disabled.  For longer text, you may want to include the message in the form itself.