How to edit the upfront Account page layout?

Hi,
Im currently using the Upfront Spirit theme. The account page is generated using two shortcodes. which creates a slight issue that i cant edit the layout directly with the upfront theme? Currently the Username & Password fields are offset at two different locations. How can they be aligned one on top of the other and centred in the page?

Screenshot public view - http://take.ms/t7ohZ + (changes to make)
Screenshot of page edit view - http://take.ms/x8QWv
Page - http://tinyurl.com/oozkg29

Support access is ACTIVE until September 1, 2015 2:26 am

Thanks
Tom