customizing field display order in subscription form

I have had no problem installing and tweeking the code of the MailChimp Widget WP plugin to get the look we want. …With the exception of the display order of the input fields in our subscription form (in the sidebar).

Could anyone lend a hand in how to touch up the plugin php to display in the field order:
First Name, Last Name, Email Address
–instead of the default (and perhaps alphabetically sorted)
Email Address, First Name, Last Name???

While this could be considered a relatively small thing, we think our desired form order will present a more inviting, personal, and less generic (and less backward) feel to our site than the default.

Thanks for any help as my php skills are pretty rudimentary at best!

http://wordpress.org/extend/plugins/mailchimp-widget/