Recently active topics in PBwiki tagged with picture

How do you change a picture on the profile? (instead of the PB sandwich or the shadow profile) I didn't like the old one, and then when I wanted to upload a new picture, I clicked on where to find the picture through my files on the computer. Then the old picture is still there, and the new picture does not pop up.

How do I get rid of the old picture, so I can insert a new one?

I want to add some images to my wiki page. However, I can't seem to get them to paste onto the page. Is there some sort of special procedure that I need to follow to add an image? My images are jpg's.

Please help.