You'll have to purchase a new copy of the game on Steam first, @ll_Rev ... and link your ESO account to your Steam account.
After that, you'd be able to buy crowns on Steam.
"May you walk on warm sands."
"First, I would ask that you look to the poor and the suffering around Cyrodiil. Look into their hearts, and then look into your own."
"May Auri-El's light guide you in your darkest hours."