Setting Youth class presidents

I am attempting to set the callings for Laurel President, Mia Maid President, and Beehive President. These callings do not show up anywhere that I have been able to find on the add calling page for LDS.org.
I am also unable to fine the calling for First Assistant for the Priest Quorum.
Could someone direct me as to where these calling are listed.
I see the adviser callings for these classes but not President or First Assistant.
Thanks

In LCR, from the menu select Organizations > Young Women. Click on the link for the appropriate class (Laurel, Mia Maid or Beehive). Make sure the Callings tab is selected and it should show the standard presidency callings.

Thanks