From GEWar Manual
You can also access it by clicking on the "Home" dropdown menu on a game page and choosing "Your Main Page".
If you didn't create a game account yet you will read there how to start playing, check Getting Started for more info.
After creating account
If you already have a game account the Index Page shows you the latest attacks you received, like troop attacks or nukings on your city, attacks on your army standing outside a city or a homebase.
You also see a link there to check how many users were online in the past.