You can do it 3 different ways ...

1/
Use the BBC CODE
[img] http://www.where your image is stored on the net.com [/img]
No spaces just the exact URL of the images you want to display

2/
Store your images on Photobucket.com or similar and once stored , right click the image and copy the image location (URL) ..
Then when creating your post or editing it...use the button in the tools bar on the edit post window you are using, to install/paste the URL into your post where ever you want ..

3/
Upload your image into your own created CBRF photo album from your own User account CP ..
Open them within your album and right click again to copy the URL or image location and then install/paste it into your post from the edit window using the button again...


Easy !!