I am trying to set up contacts to multiple accounts. The directions say to allow users to relate a contact to multiple accounts within Account Settings, but I do not have that option, and I read that the exercises should be updated but it is not. How do I allow this so I can do the challenge?

I am trying to set up contacts to multiple accounts. The directions say to allow users to relate a contact to multiple accounts within Account Settings, but I do not have that option, and I read that the exercises should be updated but it is not. How do I allow this so I can do the challenge?

Where can I found the "Allow users to relate a contact to multiple accounts" setting? I'm not able to see it under "account settings" menù.