procedure Readthefile;
  var MyIni: Tinifile;
        S: String;
begin      
     MyIni:=TIniFile.Create('/home/MyShare/Test.ini');
     S := MyIni.ReadString('TestSection','TestValue','');
     Edit2.Text:=S;
     MyIni.Free;
end;

procedure writethefile;
var Myini: TIniFile;
begin
      MyIni:=TIniFile.Create('/home/MyShare/Test.ini');
      MyIni.WriteString('TestSection','TestValue',Edit1.Text);
      MyIni.UpdateFile;
^^^^^^^^^^^^^^^^^^^^^^^ 

      MyIni.Free;
end;