To select multiple text objects:
Click one text object (not a button) to select it, and then choose Edit > Select All Text Objects or press Command-A.
To select just specific text objects, press the Shift key as you click each one.
Press Command-I to open the Text Info window.
Use the settings in the Text Info window to adjust the typeface, size, font style, and color of the text, and add or remove shadows. The settings are applied to all the selected text.