Disable field & Resize the modal size window

Hi
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I have a few question.
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1) I have one field that will read/load the page title in the field. My Question is how to disable this field so that users cannot edit the text inside the fields. They only can view or read.
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2) How to resize the modal window size.
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thank you

Info->Extra Attributes, put in

readonly:readonly

Thanks for the reply healyhatman.
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Now waiting answer for question no.2.
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=)

Use a custom CSS element, add in the code you need.
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Right click the modal window and select "Inspect" to find out the class or id of the modal window element.