If you wish to add pictures to your contribution, click the ‘Add Media’ button to do this - this is the button highlighted in red in the image below.
(If you move your mouse over the other buttons in the toolbar, you can see what they do. You may wish to experiment with these other buttons to become familiar with them.)
Once you click the ‘Add Media’ button, you will be taken to an ‘Insert Media’ page. Click on the ‘Upload Files’ link at the top, then click on the ‘Select Files’ button to select and upload your image file.
Once you have uploaded your file, click on the ‘Insert into post’ button at the bottom right of the screen to insert your image into your post.