[NSFW] Section Block Section Structure

I have made a subscribe form and centered in the section block before and it looks like this. https://landlord167.com Please see subscribe form at the bottom of the the page. I am trying to do the same with Nonesky.com but iam getting an error when I adjust the Section Structure and try to align center like landlord167.com.

Please see the structure how i need it but when i replicate it i get an error?

Screen Shot
https://drive.google.com/file/d/1yavEumaRCs3KNZ1Yc5eVk02BG9fr2bH_/view?usp=sharing

The page I need help with: [log in to see the link]