Establish many-to-many module association

Establish many-to-many module association

I have a real problem with this video : https://www.youtube.com/watch?v=G1PAKXPXI0g&t=153s.

It shows the creation of the multi select field in the contacts module and shows the contact information in the Account Module in the standard Contacts field below the business card details. In real life that does not happen they go to a seperate list, so what are the missing steps. Similarly it shows the different contact details for the different Accounts held in the Link module but I cant find any way to recall the information back to the Accounts module view.

Can we have the missing information clearly shown?