Two of them are under admin
Admin -> system info, and Admin -> user management
The third one should be pretty much on the first page of your my.Atlassian account (I've not got a Cloud install at the moment, so I'm not familiar with the current details)
If they're no longer with you, there's not a lot you can do unless you can get access to their email account. If that's not possible, then you'll need to contact Atlassian support to get your account added ans an owner of the system. Https://support.atlassian.com will help you with that.
More and more people are building their careers with Atlassian, and we want you to be at the front of this wave! Important Dates Start the Certification Prep Course by 2 April 2019 Take your e...
Connect with like-minded Atlassian users at free events near you!Find a group
Connect with like-minded Atlassian users at free events near you!
Unfortunately there are no AUG chapters near you at the moment.Start an AUG
You're one step closer to meeting fellow Atlassian users at your local meet up. Learn more about AUGs