How do I delete an element in the different modes?
Right-click on the element name in the directory 'tree' on the left hand side of the page, and you will see three options: Copy / Paste / Delete. Click on "Delete" to remove the element. This works at both the element and section level. For a section, it is important to note that deleting it will also delete ALL ELEMENTS contained within the section.
In Easymode just drag the element and drop it into the trash section to the right. Make sure that you update and save the form, else the element will be restored.
In Classicmode you just need to select/check the element in your element list and click "delete" in the top menu bar.