You don't need to go to the dashboards for this.
As shekhar mentioned, kindly contact your account admin for this.
If you're unable to figure out your admin, you can always contact client care.
Hope that helps
Where exactly do I go on our dashboard to find all that info?
Thanks for reaching to Adobe Community.
You need to reach out to your Account Manager or the Client care team, if you are a supported user, with the details of the new primary contact.