Increase text and Box size

Please include a link to the page on your site where we can see your form so we can help you with the CSS.

Add this to one of your theme's stylesheets:

[css]
body .gform_wrapper textarea.small {
    height: 200px;
    font-size: 20px;
}

Adjust the values as necessary.

Wordpress dashboard > appearance > editor > style.css

Yes. If the file is editable, that is the quickest way to do it.

This CSS should take care of all inputs on that form:

[css]
body .gform_wrapper input[type='text'] {
	height: 24px;
	line-height:20px;
	font-size: 16px;
}

body .gform_wrapper select {
	height: 32px;
	line-height:20px;
	font-size: 16px;
}

body .gform_wrapper textarea {
	font-size: 16px;
	height: 200px;
}