How to add more widgets in blogger layout?

I have a custom layout that i'm using, but can't figure out how to add widgets under the 'blog post.'
Every where I read on google, it said to do "this", but it's not working. Isn't there a 'max=2' or something in the HTML code of blogger that only allows two post under the main section? I can't figure this out. Screenshots attached.
Thank you!!
The area marked in yellow is where I want to put the widgets, but it's not letting me.
Halp!

See original post by WonderingCoder