how to set up a meeting without a host

[WeBEx beginner user]

How to set up a meeting where people who have link, can join the meeting before the host starts it?

I assume the settings are under "Site Administration", but whenever I try to go there it takes me to this page:

I would appreciate your help with this problem!

[Gasper A]

Hello, instructions to do this is documented here; https://help.webex.com/en-us/article/WBX63066/How-Do-I-Enable-the-Join-Before-Host-Option-for-Personal-Conferencing?