Insert WordArt to add effects to text and visually transform your text and slides.
Select Insert > WordArt and choose the style you want.
Convert text to WordArt
Select the text.
Select the Format tab and choose the style you want.
Customize your WordArt
Select Text Fill, Text Outline, or Text Effects and choose an option.
Drag the textbox handle to resize and enhance the effect.
To place the text behind the image, right-click the text and select Send to Back.