[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