Navigate to the user details for the person who wants to allow others to schedule meetings on their behalf.
This can be done from the admin portal or from the user's account.
Once you are in User Details, select "Settings and Permissions"
Underneath "Schedule Meetings for Me", click on "Edit"
Select the user(s) that will be scheduling meetings on behalf of the account we're currently editing.
Click on save once you've checked off the user(s)
New permissions will take effect immediately, but a computer restart will allow the settings to show up quicker.
The users who were selected to be allowed to schedule meetings will now see a dropdown for "schedule for" when scheduling meetings in RingCentral.