I really have 2 questions about the form fields. The first is about how can I make the font size larger that is typed into the box? Many of our users are elderly and will have a hard time reading what they typed, the words are so tiny.

Also, in testing I had no issues, but when someone else tested the form, the message field said it was not filled out....but it was filled out. It was set as an alphanumeric field. And as I said, it worked for me a week ago, but now it doesn't work. I removed the alphanumeric setting and it worked? Why is this?

You can make the text from the field larger by adding a declaration to the the field component's id in the CSS and Javascript section (found in Form Properties)
e.g.

More information on this topic can be found here:
http://www.rsjoomla.com/support/documentation/view-article/600-how-to-perform-layout-and-style-adjustments.html

For the second issue, alphanumeric is a combination of alphabetic and numeric characters, and is used to describe the collection of Latin letters and Arabic digits, keep in mind that accented or other kind of special characters will not be validated.

More information on validation rules can be found in this article:
http://www.rsjoomla.com/support/documentation/view-article/826-textbox.html

Thanks! The font code worked.

As for the error message. There are no special characters being entered.
Only "This is a test."

Does alphanumeric have to be letters AND numbers or is it letters OR numbers? I suppose there doesn't really need to be a setting for this at all on the field, but it is required and I wanted to validate it only contained letters OR numbers.

Can anyone help answer why this is not working properly? As far as I can tell the way I had it set up should work, and it did at one point. Now it just stopped working? I would like to understand what is going on here.