Edit auto displayed text & change submit style

Hello WPMU, great set of plugins - thank you. A few questions:

1. How do I change or edit the text that automatically displays: "This content is password protected. To view it please enter your password below:" & "Password:"?

2. How do I change the look for the submit button?

3. The website is using a theme, is it possible to use their button styling from the shortcode and if so, how can this be done?

4. Can I change the styling so that the text is the size I specify it to be? Can I edit the line breaks? And can I move the submit button below everything?

I am a novice when it comes to coding, so any details you can provide will be greatly appreciated.

Here is the page I am editing for reference:

Thanks in advance,