As it comes pictures are not able to be posted so you need to activate it:
(Note these screenshots were not on the default theme but its the same layout )
1. Go to the Administer on the navigation window and click on 'modules'.

2. Scroll down a little and make sure 'Content' is turned on:

3. Scroll further down to the Images section and turn on what you need. I suggest Image, Image Attach and Image Upload but the other ones can be useful too.