Earnings is an embedded semi-google adsense portal. You use earnings to quickly reformat your already functional ads and to learn trending adsense tricks. It's pretty limited anyway, especially when compared to
the main adsesnes website where you do every single analysis, including that of ads progress and also getting the HTML Javascript of your ads if you want.
Earnings is actually used to
1 activate adsense account
2. Reformat, reposition adsense presence/location on your blog
3. Swap adsense Account
4. And to automatically log into the main adsense portal