Help me go back to GB 2.3.6

[Sweet Pikake]

Help me go back to Gingerbread 2.3.6. I have an AT&T Samsung Galaxy Note, stock ICS 4.04 from Kies Air. I did not backed up prior to upgrading, my bad. I'm a newbie so if possible, I would need the clear and precise sequence of events that needs to take place. Thanks