A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
On each slide layout where you want a footer to appear, uncheck and recheck the Slide Master>Master Layout>Footers option.
Once the footer is on the slide layouts, visit each slide where the footer is to appear and click on the Home>Reset button. This updates each slide to its layout.
If the footers are still not visible, choose Insert>Header&Footers, check the Footer option and choose Apply to All.