You missed some text that says "TAB or I opens the inventory... etc". I guess you did need the entity detector information.
i went back to find out what i missed. i think the tutorial prompt was too verbose so that when i saw my objective was to pick up blocks i just put it together from what i already knew. it doesn't help that it's at the end of a tutorial gauntlet and that tutorials will spam the screen, including the same tutorial multiple times