The following method describes how to create a team while you're using the Personal Edition of Feishu in desktop. Once the team is created, you'll become the administrator of the team.
Note: This method is only available to Feishu V3.37 or above.
Usage
In your Feishu App on the desktop, click your profile photo in the upper left corner. Then click Join or Upgrade to Team - Upgrade to Team Edition.