How can I pass the value to the one form to second one in delphi?

You can just access it.

Mention your Unit1(Other form) in Unit2(1st page) in uses
In case you have already added unit2 in unit1 uses, You will have to add unit1 in implementation uses section of unit2.

You can then just call the items.

Sample(from implementation section):

implementation

{$R *.dfm}

uses
  Unit1;

procedure TForm2.Button1Click(Sender: TObject);
begin
  if Form1.CheckBox1.Checked then
      Label1.Caption := 'Checked'
  else
      Label1.Caption := 'Unchecked'
end;

end.