Login to your account from the Covideo website. Click on Graphics followed by Email Icons.
To set your default email icon/thumbnail image, click on "Set Default Email Icon". Select the one you wish to use as your default by dropping down the list and then clicking save when you are done. Please check out the video below:
To upload an icon, click on Upload Email Icon. Name your icon and click on Browse to find the file on your computer. We do no resize your image. Whatever the size of the image you upload will also be the size of your email icon. The file you upload must be in JPEG (.jpg) or GIF(.gif) format.