I don't think you can change the text box field properties using Reader; you would need an Acrobat type of app. The blue field box lets you know there is an active hyperlink and not just blue print that is underlined. If you open the same pdf in another pdf viewer you probably see the url with a blue underline but it isn't active. Kind of frustrating to see a blue underlined url and it doesn't work when you want to jump to it. In Adobe Reader, the light blue field box lets you know the link is active and not just blue print that is underlined. If you want to be able to follow the link you won't be able to in other readers. It's also handy to be able to identify the active links to more easily avoid making an accidental jump. The hyper-link field boxes are not always blue - in a colored background they might look like shadows. The colored field box should not show when you print the doc or when you view on other than mobile devices.
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