- Log into you Google AdSense account
- Go to AdSense Setup tab.
- Click on the Ad review center.
AdSense Ad review center
You can either allow or block the Google certified ad network. Certified ad network is like this that you are viewing the ads of google on your blog. so you can also view the other networks ads. so if you want to view the ads of other network or block the ads of other network you can do like as under.