I'm glad you liked the article. I actually didn't need to report any STEEM last year, so I just tried to figure that out. I don't see any easy way to import the wallet address yet. But anything you had on a exchange would automatically be tracked through the API. I found someone that wrote a parser for the STEEM blockchain, then did a manual CSV import to get the data on Cointracking.info. So there is no easy way to do it yet with a wallet address. :(