Upgrade to display on a website following instructions in this link: https://support.google.
In this case, ads will not begin showing until you complete the PIN Process and enter your PIN -note that it can take up to 48 hours after entering your PIN/verifying your address before the ads display, so be patient. (See: https://support.google.
com/adsense/answer/157667?hl= en&vid=1-635792076383490765- 1595138867)
Wordpress.com: you cannot place Adsense code on Wordpress.com hosted sites, not even if they have a custom domain. Wordpress doesn't allow it, and the codes will not enter correctly.
Wordpress.org: if you are not using the official Adsense-Wordpress plugin and have placed the code manually, check to make sure it is not corrupt. Some templates will do funky stuff with the ad code (most often what we see is line breaks at the end of each line of Adsense ad code - you'd need to remove those. To install the official plugin if you want to try it see: https://support.google.com/
adsense/answer/3380627?hl=en& vid=1-635792076383490765- 1595138867
Blogger: if you are trying to paste the AdSense code into the <head> or after the <body> tag of the template's html you'll get errors. Paste the ad code into an html gadget for blogger (layout page, + New Ad Unit, paste code, position gadget), OR use an Adsense Gadget (layouts page, +New Ad Unit, Adsense Gadget), OR use the earnings tab of your blog to place ads in the sidebar and posts.
Other web builders: if you are using a website builder provided by your hosting company (like Godaddy's web builder, or Yahoo Site Builder) then you should ask for help at the support center for the product you are using. Unless one of the volunteers in the Adsense forum has used these other products, it isn't likely any of us can provide much help with specific products.