You can reset an instance password if you do not set a password when creating the instance, or if you forget or want to modify the password.
Note: For data security consideration, we recommend you to periodically change your password.
Log on to the MongoDB console.
Find the target instance, and click the instance ID or Manage to go to the Basic Information page.
Click Reset Instance Password in the Account Management column.
In the Reset Instance Password window, enter a new password and click OK.