After you have configured the ads for your domain name, you will be sent an email to verify the association of the domain name to your Google AdSense account. Follow the instructions on the email and allow for up to 72 hours for the ads to be displayed on your website.
If you have done this but your ads are still not being displayed, please check that your domain name configuration is correct y doing the following:
In the Domain names section, select the relevant domain name in the drop-down list and click on the Manage button.
Click the Manage DNS link.
Make sure that the IP address in the A, CNAME and TXT records section is 18.104.22.168, if this is different update it.
Click on the Update DNS button.
Please allow 24 - 48 hours for the changes to the DNS to propagate.