{Steemit} Change in the Steemit wallet ???

Can somebody explain to me what happened? I'm a little silly with this change. Every change creates a certain discomfort, right? It was all so simple, now it seems to be no more ..

I have already understood that this change comes to improve the security of the application. Just do not understand yet which key goes where. The class of the old ones, the most understood, can explain to me and to the people who read my posts here the comments?