Nine Things That Often Go Wrong in PowerPoint 2013
PowerPoint won't let you edit what you want to.
No matter how hard you click, PowerPoint won’t let you edit that doohickey onscreen. What gives? The doohickey is probably a part of the Slide Master. To edit it, click the View tab and then click the Slide Master button in the Master Views group.
This step displays the Slide Master and enables you to edit it. However, the object you’re trying to edit might be underneath another object. If so, move the other object aside temporarily. When you’re done, drag the other object back into place.