[Sandiel]

Ontop of your script.

pawn Код:

enum pInfo
{
     pPassword
}
new PlayerInfo[playerid][pInfo];

Now, the command

pawn Код:

COMMAND:changepass(playerid, params[))
{
    new newpass;
    if(!sscanf(params, "s", newpass))
    {
        // Open his file here, edit the Password, close the file, done.
    }
    return 1;
}

I expect you know how to use YSI\Y_ini well.