Trying to add submit button to the same line as a data field

I've found other posts dealing with multiple data fields on the same line but not one addressing the submit button with a data field on one line.

I'm trying to use the widget in the sidebar for an email signup. You can see an image above of what I'm trying to replicate with the actual widget below with the same background image.

I'm having some padding issues and can't seem to get the submit/go button up by the email field.

http://commonhope.org/beta/site/

Any thoughts would be most appreciated?

I did my best to try and implement this without success. I tried tweaking the setting to other values and of course subistituting my form id number.

Could I please ask for a little direct assistance. I've left that code suggested from the other post in my css if that helps.

I'd appreciate any more thoughts about what might be causing the conflicts.