Sign up with a advertiser (Google Adsense, etc). They will give you the code you need to paste in. Blogger has an app that let's you insert Adsense, since Google owns both.
This is a common myth, there is no Julie in the Gosselin family.
You are probably looking for Truthbreedshatred, which is a blog created by Julie who is "Aunt Jodi's" sister.
Aunt Jodi is married...