Make changes to title master
1) Select the 'View' menu and select 'Master'. (The Master submenu appears.)
2) Select 'Title Master'. (The Title Master slide appears, displaying the 'Master title placeholder' and the 'Master subtitle placeholder'.)
3) (Optional) Enter the desired text in the 'Master title' placeholder.
4) (Optional) Enter the desired text in the 'Master subtitle' placeholder.
5) (Optional) Format the text as desired.
6) To return to slide view, select the 'View' menu and select 'Slides'.