You have to be the team admin to manage your team members.
If you are the team admin and you want to edit your team members, here’s how:
If you want to remove a member from the team, just click on the “x” next to the respective email address and confirm that you want to remove this user. You have now a free seat that you can fill by adding another team member.
Once you’ve added a team member he or she will have immediate access to all the Pro features. If you remove a member from the team, he or she will be downgraded to the Free plan immediately.