<i class="fa fa-linux fa-4x" aria-hidden="true"><!-- --></i>
Any tag in the Edit+ wysiwyg editor that is empty will be stripped out. Therefore, for the <i> tag to work we need to put a character in between the <i> and </i> that will not be shown.
We do this by putting a html remark in ( <!-- -->) that will not display, yet the font awesome icon will.
This must be done in the code editor.
A penguin : .