To update the description/location of your photo on the desktop site:
- Go to your profile.
- Click on the Photos tab of your profile page.
- Locate the photo with the caption you would like to edit.
- Click the ellipses (...) button just above the photo on the right and select the Edit option.
TIP: The only way to change a photo description/location on the mobile site is to delete the photo, then repost it with the correct caption.