You will need to create a text bow on your page. This is the Box on the tool bar that is normally down the left hand side with a letter A in it. Select the box and Drag the curser to make the text box. Then select the content tool, the one with the hand on it and away you go. If the tool bar is not there then press F8 and it will appear.
Or when you create a new page select Automatic Text Box, then you will be able to type to your hearts content. If you can't fix it in 20 call someone who can.