To access Design Pod Details of particular design, click on a specific thumbnail in the library. Example below shows selecting the Snowman Vintage Applique Embroidery Design. 

Example: Snowman Vintage Applique Embroidery Design Pod Details

To add additional files to the design pod, click on the Add Files button.

Click Browse to search and select a file to upload. 

A browse window will appear similar to the image below. Select the file you want to upload and click Open.

Then click the Upload button.