You should be able to go to your apps icon and then select downloads. Everything you have downloaded should be in there. If you hold down on the item you want to delete, a menu should appear where you can delete the item.
You should also be able to delete it by connecting it to your computer with the provided USB cable. If you go into the device, then downloads, you can delete them from your phone using your computer as well.
Keep in mind that if you back up the the Verizon Cloud or Google, those files could be backed up there as well.