The draw documention says to change the selection mode from object to text. It says “Click this field to open a popup menu with the following options” but ti doesn’t say WHICH field to click and I can’t find anything to switbh between selection mode.
I don’t think there is enough information in your question. What documentation, page, link? What object?
Anyway just press key F2 (possibly Fn+F2 on some laptops), that will get you into text edit mode in most instances for most objects. Otherwise double-click, or Insert > Text box