Subscription Form looks messed up on the Registration Page

Sorry if someone already asked this, but I am having real troubles with the membership plugin. I didn't want to have the ability for people to register on my site but I was having some other problems (see my other posts) and thought that maybe these were being caused by the fact that I had no subscriptions or forms in place. So I made a 'guest subscription' that would have limited access to my site. However, when I added the [subscriptionform] short code to my page, the layout of the registration form was very messy. I tried changing this to a full width page and using short codes to use a 1/3 page space and a 2/3 page space...they all looked bad. How can I improve the look of this form?

View the messiness at http://www.sasitup.com/partners/guests