I think you are experiencing this as a result of the pages being template based and having most of the head area locked for editing. I found that if I go into split view and put my cursor in the editable region of the head titled 'doctitle' I can add in these keywords. Just make sure to put your cursor after the ending </title> tag. As for the page title this is partly dynamic and set with php code, but you can customize if you would like since it is in the editable region.