Trailhead instructions go:
Assign an Account Team
On the Accounts tab, select an account to view and scroll down.
On the Account Team related list, click Add.
Click the search icon to select a Salesforce user to assign to the team. If you haven’t set up any other users, the only person that you can assign to the team is yourself.
For each team member, select a level of access to the account and to opportunities and cases related to the account.
For each team member, select the team member’s role.
Click Save.

this is not working, while when scrolling down, there is no option "Action team" although I have enabled  Account Teams at  Setup ->  Customize | Accounts | Account Teams.
I cannot finnish my Boot Camp Challenge due to this - any advise is valuable!