I can't add a game to my collection.

[okr]

In your profile go to Games => enter armored edition in the "Add Games" Box => Select the appearing Wii U game via the Wishlist button => go to your Wishlist => select the same game via Add button and it appears in your game collection (My Games).

Own experience over the past 6 and a half years: VGC once had one of the best videogame databases around. The days of the TalonMan. Those days are long gone.