Hello,
Your storage server is the place/server you have uploaded you image to. For example the sword.jpg fire sword image you used is on the wildfireentertainment.com server. Assuming that any other images you are going to use are in the same folder on this server you would use the same http:// you used for the fire sword image and change the name of the image (xxxx.jpg) for each image you wish to use.
As our friend djenin has said, you can also include images within the text of your message by using the image tab. Example:
[img]address of your image[/img]
Hope this helps.