You can use Pixlr.com, an emerging alternative for the soon-to-close Picnik.com to create a banner for your digital portfolio.
- Go to Pixlr.com
- Open an image from your computer
- Resize for appropriate Digication dimensions: 779 x 200 pixels
- Add effects and/or text
- Save banner to your computer
- Insert your new banner via Portfolio Settings > Customize
- Scroll down and Save