Right-click the text and choose Drop Shadow from the menu that appears. Alternatively, select a single text element and then choose Text Drop Shadow from the Format menu.
Click the Add Drop Shadow box so that a check mark appears.
Choose a colour for the shadowing by clicking the Colour Button 
. Choose a shade from the 40 standard colours on display, or click More Colours to select from a colour cube.
Choose the horizontal shadow offset by clicking the arrowheads next to the X indication. Positive values cause the shadow to be increasingly offset to the right of the text. Negative values cause the shadow to be increasingly offset to the left of the text.
Choose the vertical shadow offset by clicking the arrowheads next to the Y indication. Positive values cause the shadow to be increasingly offset below the text. Negative values cause the shadow to be increasingly offset above the text.
Click OK to add the shadow.