The screenshots are taken from an Apple computer but it should pretty much be the same for the PC side except for the contextual menus. Feel free to give me input on any revisions that need to be done to make it a better tutorial. Thanks..
here we go...
On the top of the website select "Photo Gallery" under "Community"
Once your in the photo gallery, select "UPLOAD PHOTOS".
You want to select the "Browse" button so that you can access your computer and "show" the website where to find the images you are uploading to your gallery. You can upload up to 5 images in one shot. If you need to upload more than 5, just repeat the process here.
After you select the file(s) you should see the file path to the image.
If it looks correct to you, scroll down and select "upload/submit" button and you should see this.

It will tell you when its done with a preview,double check and press the "Process" button.
When its done uploading it will throw you back into the thumbnail gallery and just double click on the image you want to put in your post.
On the PC you need to right click on the image to get the contextual menu. On a MAC just hold down the control key and click once on the image to pop up the menu.
You want to copy the image location not the actual image. This will copy the URL of the image oppose to the actual image.
Now to get the images in your post you have to select the following icon.
Which will result in this window popping up and you paste the image location here.