Click on any text to edit it. If you want to increase the size of the box that the text is contained in, drag from any of the box's corners.
The text edit submenu will appear as soon as you click on a piece of text. The menu lets you change the:
Tip: Remember to drag the text box as you make the text bigger so it is aligned as you want it to be. If you don't make the box bigger some of text may be hidden.