When you drag an autofield into the layout, the autofield will be initialized with a defule font and color. You can then change the font and color with the default Mac font dialog.
Double click the text field to begin the edit mode. You will see a ruler when the field is in edit mode. Select the text and open the font dialog by selecting the menu item or pressing Apple-T.
You will see the alignment buttons on the ruler. Use this button to align the text field.