Procedure :

1) Go to Format / Area (Yes, believe me! We start going to “Format Area” )

2) Choose BITMAPS on the window and click the Import button

3) Name your imported bitmap

4) Go to View / Master / Slide Master

5) Right click on a free area of the slide and go to Slide / Page Setup

6) On the background tab, choose bitmaps from the drop-down menu and select your previously created bitmap.