To add and edit a text box:

1. Click on 'add text box'

2. Double click on the text box and type your text in:

3. Highlight your text by clicking and dragging the mouse over it. Click on the T symbol to change the size, font etc.

4. Once you are happy with the way your text looks just click anywhere outside the box. If you need to re-edit the text then you just double click on it again and use the same features shown below.