Just to make sure that all is clear, I'll add these screen shots to Brother7's comments.
1. Be sure to login first.
2. Click on the singular Portfolio as shown here:
3. You will now see the photos in your portfolio. Here is what it will look like:
Naturally it will have your name, not mine, and you won't see any helpful red arrows.
4. Click on the photo you want to edit or delete and then you will see this screen:
5. Now use the Edit or Delete link that is circled.
Cheers,
rfs