First, you need to go to the "Gallery" ( click "Gallery", just under the rear of the front tire on the VN750.com banner)
Upon entering there, click "Upload Photos"
Next, choose where you want to post the picture.
Now you want to click on "Browse" to get the pic off of your computer
Once you have the pic selected, you can add a title and description (but you don't have to if you'd rather not)
Once the pic is uploaded, right click the pic to get to the "Properties"
Copy the info in the "URL" line
To add the pic to your post, click the postcard looking icon
Then paste the copied URL in the box
(make sure you don't have two 'http:'s' in front of the URL)
The result should look like this