2 questions about the body text and members space

Hello,

I switch the old blog for the new blog yesterday. I can personalize a lot of items. But, after a few hours, I don't succeed to change the body text in my articles. The font size is too big. How can I change this please?

Also, it's possible to remove the members space? I think it's possible but I don't forget...

And the last question (sorry), is it possible to have the blog's statistical with the new blog (like the old)?

Thank you for your help.