At the top of most pages on EcchiDreams, you'll find a small icon with three lines (called a hamburger button ≡). If you click on it you'll be presented with a menu, like so:
This has been circled in green so you can see it, just tap on that.
You will then be presented with this menu:
Just tap on account, and you'll be taken to the next menu level:
Notice "Account Settings", which is highlighted with a green underline; tap on that.
You will then be presented with this screen:
Tap the "≡ Settings Area" button
Where you'll see this:
And it really is as simple as that.