Please Note: All the images in this answer can be opened larger, in a new popup window, by clicking on them.
At the top right of the text box where you type in the article is a little image of a camera. Put your cursor in the text box where you want the image to appear (1.), then click on the icon (2.).
You need to click the '''upload''' button to get to the image upload screen. Now you will get a pop-up window that allows you to enter a title for the image and choose a file off your PC hard drive.
The image must be on your PC so that you can find it here and upload it to the website. Also make sure it has a filesize of less than 800kB. Click 'Browse' to go and find the image.
Then click OK or 'Open' on the 'find file' window, so that it closes and the name of your image file is left in the text field next to the 'Browse...' button. You should end up with a screen that looks like this:
Confirm you have the right file (8.), and click save (9.).
You will get to the last screen where you can adjust the image title and description, and adjust the advanced display properties if you wish. The default properties are the best option in almost all cases.
All you need to do is click the 'insert' button.