How do I get the "Create an Account" screen after a person clicks "Signup" to...

Hi:

How do I get the "Create an Account" screen after a person clicks "Signup" to include a right sidebar?

also

How would I get the "Create an Account" screen after a person clicks "Signup" just be centered on the screen with the text and empty boxes being close together instead of far apart like they are now?

Please let me know.

Thanks.