I see nobody has answered you as yet so I will give it a try. Your message is a little hard to follow. For a start, the previous photo you have loaded will always be there, in your site, unless you delete it. You don't say where it is appearing.
If you successfully added another photo that will appear as well. You then edit the photo to add details and put where wanted.
Load your second photo in the site. To do this click on "edit" in main heading on home page. Then click on "photo's" in main heading > upload photo's > browse. Then select your photo from your computer. Click "upload". Your photo should appear, still in edit mode. Complete the details on left side of page and click "save/done".
If you need more help please be explicit and tell us exactly what you have done and where you are at.
Keep trying.