From the Motorola Website:
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You use the Text-to-speech settings to configure the Android text-to-speech synthesizer, for applications that can take advantage of it, such as TalkBack. TalkBack speaks the labels or names of items as you navigate the phone’s user interface.

Step 1: Enable Talk Back:

1) From the home screen, press Menu
2) Touch Accessibility
3) Check Accessibility
4)Touch TalkBack
5)You will be shown a disclaimer, touch OK

Step 2: Edit the Text-to-speech settings:

1) From the Home Screen, press Menu
2) Touch Text-to-speech
3)The following options are listed:

a) Listen to an example - Plays a brief sample of the speech synthesizer, using your current settings.

b) Install voice data - This is greyed out because the speech synthesizer is already pre-installed on your device.

c) Always use my settings - Check to use the settings on this screen in place of speech synthesizer settings available in other applications.

d) Speech rate - Opens a dialog where you can select how quickly you want the synthesizer to speak.

e) Language - Opens a dialog where you can select the language of the text you want the synthesizer to read, so it is pronounced correctly. This is particularly useful in combination with the Always use my settings setting, to ensure that text in a variety of applications is spoken correctly.