Where do posts show up & How to restore 3 columns

Hi,

I started using wordpress for our website haveartwilltravel.org. As I edited the theme I some how have ended up with pages showing up but not posts.

Also, I edited the 3 column theme down to one column. Is there a way to get the other columns back without losing the content I already have?

I’m thinking of downloading the original theme and comparing code in order to restore it.

Is there a better way to do this?

Thanks for any help you can give.