Every Kerika user owns an account: it automatically set up for you when you sign up as a new user.
This is true even if you signed up because someone had invited you to work with them on one of their boards: this means that you own your account, and all your coworkers own their own accounts.
Your Kerika account started off as a free, unconstrained account for the first 30 days trial, during which you could create as many boards as you liked, and share them with as many people as you like.
After your 30-day trial is over, you will still own your account, and any boards that you had previously created, and you will continue to be able to create new boards that you own.
However, if you want to continue to pay for others to work as Team Members on your boards – i.e., be active members of your board, able to make changes to your cards, content and canvases – then you will need to pay for them.
Each account is associated with a specific email address:
Here's an example: you have three boards with a mix of Team Members and Visitors.
(The Team Members are highlighted here in red circles, and the Visitors in blue circles.)
Everyone who is a Team Member, on any of your boards, is part of your Account Team. People who are part of your Account Team can create boards owned by you.
As Account Owner, you have ultimate authority over all boards that exist in your account:
When another Kerika user adds you to one of the boards as a Team Member, you become part of their Account Team, which means you can create new boards owned by these people.
So at any time you could be working on some boards that you own – and on some other boards that are owned by other people.
Once your 30-day free trial is over, you need to pay for everyone that's part of your Account Team – everyone that's a Team Member on any board owned by you.