To leave a team, first navigate to your accounts settings. This can be done by clicking your avatar in the top-right and selecting "My Account".
With your account settings open, navigate to the "Profile" tab and scroll down to the bottom and click the "Leave Team" button. Note: Leaving your team will return your account to a FREE subscription and you will lose access to all bundles created while in a team.
You will then be prompted to confirm, select "Confirm" to leave the team.