The Brainliest Answer!
for add header / footers and numbering slide :-

   i. open powerpoint presentation
   ii. click on thumbnail 
   iii. click on header and footer in insert tab then a dialog box appears
   iv. click on date and time box then click on update automatically
   v. click on fixed button  and enter date 
  vi. click on slide number
  vii .click on footer 
  viii. click on notes and handouts tab and make the same changes to notes and handouts page .
   ix . at last click on apply to all and apply 

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