How do I add a text box. Can't find grey pencil to add text in editor

Hi there,
I needed help adding a text box please. I have added a picture also. I was in editior deleting text and wanting to add new text. When I returned to the page, the text box was gone and now I cant see the grey pencil which can add the tect for me. How can i do this?

Thanks in advance,

Here is my public share link: LINK
(how to access public share link)