what is a passcode and how can I get rid of it?

if you know it turn off in settings- general - passcodelock

if you dont know it do this

recovery mode

open itunes on computer

plug cable into computer not iOS device

turn phone off

hold home button and plug cable into phone. do not release home button until an itunes graphic appears on device.

look to computer should have message about recovery mode click ok and restore

Peace, Clyde

if u need an article see

http://support.apple.com/kb/HT1808

Read here:

To turn it off:

Settings>General>Passcode...enter your passcode, then: Turn Passcode Off.

http://support.apple.com/kb/HT4113