Only allowing 1 blog per user and Edu Blog home page question

I read a post on here that gave me a code to enter into the themes function.php file to limit users to only 1 blog but it doesn't specify where to put it in the file..does it matter.

Second, I am using Edu Clean and on the non logged in users home page I only want a logo, slide show and member login on there how can I customize that to happen?