@meehoo - Changing team members is easy. You simply delete a member from a team, which frees up a license/paid seat, and then add a new member to the team who will consume the available license. I outlined the steps on how to do this in a post from a few hours ago:

https://community.miro.com/ask-the-community-45/licensing-5645?postid=23630#post23630

Thanks Robert! It has been very helpful. the team i am on is going to start that plan quite soon. Then i am sure this cummunity will help us a lot.