Here's how to upload a photo to your group's photo section:
1. While in the group you'd like to add a photo, click the "More Group Options" drop down menu, on the right of the page.
2. Select "Photos".
3. Choose the album you want to upload the photos to.
4. Click the blue "Add a Photo" button and follow the prompts to upload your photo to the group's photo section.
Note: The photo must be saved on your computer.