To insert an image into your website, log into the interface and click "Pages" => "Manage pages" on the menu. Then select the page you want to insert an image into.
Click "Insert image" above the editor.
You have the options to do the following:
a.) Upload an image from PC
b.) Browse the server for an existing file
c.) Paste the URL of an image from another website
If you have chosen an image, click the "OK" button and in the following window you can adjust the settings for your image.
Click the "OK" button again and the image will be embedded in your page.
Tip: You can insert an image with Drag & Drop if you move it from your PC to the editor easily.