In Essentials, you can delete portions of a design by selecting the color in object pane on the right and hitting the delete key. If what you want to delete is part of a color, you would need to add a color stop to create a new color break and delete that. This is explained in more detail in the following post from our User's Forum.
How to add a color break to any design - even a one color design
http://www.embrilliance.com/phpBB3/viewtopic.php?f...
Be sure to check out the other tips and techniques that are available in the User's Forum and on our Facebook page to get the most out of your software.