It's the one called "Disable all tutorial dialogs."
You can download the patches
here (or on the appropriate thread for your firmware version). Enable the patch by entering " Disable all tutorial dialogs: yes" into the libnickel section of kobopatch.yaml (with the four leading spaces), or by enabling it in the libnickel file itself. There are more complete instructions in the patching threads themselves; you can also let me know if you have more questions.