Hi Stepman,
to include pictures using the "IMG" tags (as described by Cherno), they must already be available on the internet (for example Photobucket).
The address you inserted points to a file on your hard drive. If you don't have an online hosting account, you can use the direct attachment method:
When writing a post, there is a line "Additional Options" beneath the message window. Click on it to reveal the "Attach" function. Click on "Durchsuchen" (search) to open a dialogue box that lets you choose the images to attach; by clicking "more attachments", you may add up to 8 attachments in total. Finally, click on "post" and the images will be shown at the bottom of your finished posting.
EDIT: As you apparently have a "Photobucket" account, you should use the "Direct" address line found to the right of your image:
[img]http://i123.photobucket.com/albums/o305/stepman31/torchwood_zps7cb0146e.jpg[/img]
