By splash page do you mean the contents list? Tap outside of it or hit the back button.
Background images and operations are all chosen from the settings. Tap the centre of the screen and then chose the cog. Under Themes you can chose (and update) themes and under Visual Options you can manually change the display settings.
For the operations you'll find those under Control Options.
Going back can be done with either the back button or, after you've tapped the middle of the screen, the back arrow in the top left corner.