Removing or adding elements (Slide Master)

View>Master>Slide
Master

If you use a master slide and
are having trouble removing a box or graphic, doublecheck to see if it is on
the actual slide or the master slide.  If
it is on the Slide Master and you do not wish to include it on every slide, you
will need to remove it from the Slide Master. Conversely, if you wish to
include an element on each slide, the Slide Master is extremely helpful.

Note:  When you are done editing to return to the Normal
view. View>Normal

An excellent overview of the
Slide Master with step by step instructions is located at

http://tinyurl.com/yqt5w5