ok!, this far here is the tuto!:
1.Download Internal Master 12
2.Open I.M.12 and select File->Open, then select the fifa_ng_db-meta.xml from the (Fifa folder)/data/db and press open, and on the second window select your save file DATA, usualy in (Pesnonal User Folder)/My Documents/FIFA 15/0/FIFA15/(one of these folders)*
Note here: to find your career save file I made these steps: open fifa and delete the autosaved career files, then exit fifa and go to (Pesnonal User Folder)/My Documents/FIFA 15/0/FIFA15/(one of these folders)* and find out which folder contains the DATA that is 6,34MB, this is your original career save.
3.Once I.M.12 loads the file, go to the second tab(DB 2) and select the second option(teamplayerlinks).
4.Now press the second coloum on teamid in order to sort the rows by team ID.
5.Now you must know your team ID, scroll down until you find it.
6.Once you will find it you can now find the generated players ID, how to do that? simply look at the 5th coloum that is the jersey number, write somewhere the jersey number+playerid from the 3rd coloum.
7.Now that you know which is your players ID first go to the folder (Fifa folder)/data/fifarna/lua/assignments/players and create a new text document and rename it like this player_(playerid).lua [e.g. player_281754.lua].
8.Open the lua file you created and the revolution mod Documentation/2-Statements.pdf
9.Scroll down the pdf until you see the PLAYER STATEMENTS, follow the instructions and insert whatever statements you want to your player and save the lua file.
10.Regenerate and start the game, it should work.