Double-click on the text layer thumbnail in the Layers Palette to select the text and turn on the Type tool.
To increase the font size by 2 pts:
Press Control + Shift + >
(If you are using a MAC press Command + Shift + >)
To increase the font size by 10 pts:
Press Control + Alt + Shift + >
(If you are using a MAC press Command + Alt + Shift + >)
To decrease the font size use the <





