If you’re thinking of doing an offsite link to an image, please remember that it’s safer to just upload the picture into your wp.com space. That way you won’t lose it if the other site goes down and you’re not swipping their bandwidth.
i know that… what i mean is that i have uploaded two headers and both of them goes to the wp.com space, and if i want to use one of them i have to upload it again.. that’s what i’m asking, how do i use the other one i’ve already upload???
You can save it to your desktop and upload it again. To get the URL, just start writing up a post and find the image. When you send it over to the editor, you should see the URL for it. If you put that in your browser, it should load in your borwser so you can download it.