How can I increase font size

You can use basic CSS added via the plugin settings or via your theme’s style.css, or via some other method. You can find endless tuts for basic CSS online.

Thank you Jeff starr for your reply but I don’t know programming so please tell me that where I can change. I mean on which line of which file.

The important thing to understand here is that USP does not add any CSS — it leaves it up to your theme to add the styles. So if the font is too small, you can adjust it by editing your theme’s style.css or whatever (depending on the theme).

That said, here is an example to get you started:

#user-submitted-posts #usp_form { font-size: 100px; }

You can add that line to your theme’s style.css file. If there are any issues, please contact your theme developer. Thank you.

It works, Thank you Jeff Starr