Okay Dave. Try this.
Right click on the picture you are wanting to put on photobucket. In the window that appears, click on "Edit".
The picture will appear in another window. In the upper left hand corner, click on "File".
In the drop down memu click on "Save As". In the window that appears, go to the "Save As Type:" at the bottom of that window and click on the arrow to the right. Then choose one of the other formats for that picture, JPEG, GIF, Bitmap, etc. Then save the picture.
Now you will have 2 copies of the picture. One a TIF and the other will be whatever you changed it to.
I hope this works for you. I know that I can do it on my computer.