You may enter text into the document simply by typing on the keyboard. The text will wrap around the screen just like a work processing program.
You may change the font, font size and style, and the font color using the Format menu.
You can also change the text by using the tool bar (circled in yellow):
If you wish to change text which has already been typed, remember to highlight the text by selecting it first before changing its size, style, or color (just as you would do with a word processor).