On a non-Steam account you just login to the SK website and look at the tab under Purchase Energy, but as a Steam user when you go to the Purchase Energy on the SK site you just get directed to a tutorial on how to purchase Energy through Steam.
I know how to purchase Energy through Steam, I just want to see my transaction history (trades with other players).
Thanks
(thought about putting this in technical, but its not an install issue)
Have to be sign in the forums first, and scroll all the way to the bottom where is says view history
http://wiki.spiralknights.com/Energy