[O] using org-mark-entry-for-agenda-action

[Victor A. Stoichita]

Hi,

The manual describes the function 
org-mark-entry-for-agenda-action. It should
> "Mark the current entry for agenda action. After you have marked 
> the entry like this, you can open the agenda or the calendar to 
> find an appropriate date. With point on the selected date, press 
> k s or k d to schedule the marked item."

https://orgmode.org/manual/Inserting-deadline_002fschedule.html

However, I can’t seem to find that function using Org mode version 
9.2.3 (9.2.3-20-g31873e-elpaplus). Am I missing something? 

Regards,
Victor