From Studio Knowledge Base
All you need is a computer and an internet connection.
You can use images directly from your computer as .jpg, .gif, or .png files for photo ecards. You can use .swf files for Flash ecards. For Video ecards, the file type should be .flv. Check out the dimension guidelines for the sizes that you want your ecard to appear. You can also use image editing software such as Photoshop, GIMP, MSPaint and IrfanView to edit your images.
You can upload .wav, .mid, and .mp3 files as the background music to your ecard. The music file size should be within 5 MB. You just have to own the copyrights to the music or sound file you’re uploading. You can even record your voice and put it in your ecard!
If you’re uploading a Flash ecard, you need to embed the music into your .swf file. The music uploading option remains disabled in case of a Flash ecard.
You may also opt to upload the image without music; just leave the music field blank when you are uploading your images.