Reply To: modify logo and menu emulationstation

[Xboxclassic]

Yes it is possible to do both.

Emulation bootscreen-
to insert picture of your choice you need to exit emulationstation and start Linux (startx at command prompt)
in Linux go to File explorer.
goto
/home/pi/RetroPie-Setup/supplementary/splashscreens
make a new folder for you picture.
insert your picture into this folder — It must be in either .JPG or .Png format.

now log out of Linux.

at command prompt type
cd RetroPie-Setup
sudo ./retropie_setup.sh

(if you get error about hdspace ignore and press y enter)

Go down to option 3 (enter)
Go down to option 313 (enter)
Go down to Your Splashscreen that you created (enter)

message = Splashscreen set (enter)
goto cancel (arrow keys Enter)(or Escape)

go down to 7 Perform Reboot (OK)(Enter)

as for quit emulationstation to quit
if you mean as in short to exit with single button press
either by key or joystick
then you`d have to edit
emulationstation menu configuration itself there are many tutorials on hotkey whichmay help.