I think each weather station can only have one camera. If you are looking to make the two weather stations have the same camera, I believe someone else did that.
They went to the Bloomsky station, right clicked on the image and "copy image location". Then went into the other station, edited it to be a URL camera. Then pasted in the location of the other picture.
IIRC, the image for your Bloomsky will be the same filename stored on WUnderground's site. Even though WU doesn't usually like URL pictures, since it's pointing to their own site, it works.