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Hi Iryna, this option has been available for many years but since it takes up a lot of real estate of those objects some orgs don't implement MSI on Accounts and/or Opps. The view works like a roll up, in the Account you can see all the Interesting Moments for the Contacts and in the Opportunity you will see all the Interesting Moments for Contacts that have been added to that Opportunity.
It's fairly easy to add to your Account or Opp layout, you add a new 1-column section and choose the Visualforce component. The example in the documentation is for leads so you wouldn't be adding the fields you mentioned above to the layout.
Let me know if you still get stuck in Sandbox.