Fred,
I'm not sure about photobucket, but on picturetrail.com
I select the picture i want to post and then I use the right mouse button and "right click" on the picture. A pop up window opens. Left click on the" properities" tab. Anothe window opens. on the "URL" address
such as this
http://img.photobucket.com/albums/v392/CFA/.jpg
"highlight" that address HTTP:. . . . . . .jpg.
You "highlight" that address by putting your cursor infront of the HTTP: address and while pressing your left mouse button and "drag" the cursor to the end of the address.

while this is still highlighted press cntrl C. this will copy that address.

Now when you go to your post and want to put in a picture select the "IMAGE" tab
when that window opens just press cntrl V and it will paste the HTTP: address in the address box and then press OK.

that is all there is to it!