After you start your new game, save and then open Gibbed's editor. Then, change the ME1 plot information making sure to check the 'Played ME1' box. After setting the plot variables, switch to the. Open Gibbed's Mass Effect 2 Save Editor and load the savegame you want to modify click the 'Raw' tab under ' - 2. Squad' click on ' + Player' to expand the branch. In my case, the Gibbed save-editor opened with my last ME3 savegame already in place in the interface, which leads to the inability to edit the added code. It's a touch confusing the first time around. Re-opening the save-game (which is already opened) solves the problem and confusion. Useful info related to this guideGame Editor, if you don't want to check for a new version at the SA for. Create a new save game and input the face code in the Mass Effect 2 custom face editor and then do a save as soon as possible after. Open Gibbed's Mass Effect 2 Save Editor and load the savegame.

Where do they go?!
Open up the save you want to edit and navigate over to the 'Raw' tab. Click
Player -> Appearance -> Head Morph
This is what we're interested in.
'Hair Mesh' is where you enter the 1st line (it ends in the suffix -MDL)

Open 'Texture Parameters' by clicking the box that looks like this [...]
Mass Effect 3 Gibbed
Mass Effect 3 Gibbed Codes
and a second window will open.HAIR_Diff and HAIR_Mask is where the 2nd line goes (it ends in the suffix -Diff)
How To Use Gibbed Save Editor Mass Effect 2 Mods
Hit okay to close the texture window, save your changes and you're done.