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How to reset Salesforce Trailhead playground developer org password

1. Login to your trailhead account https://trailhead.salesforce.com/
2. Lanuch your “My Trailhead Playground”
3. Setup -> Enter Users in the Quick Find box, then select Users
4. Select the User from the list and Reset the Password from the user list.
5. Check the email about the reset password instructions.

 

For Reference:

https://trailhead.salesforce.com/help?article=Find-the-username-and-password-for-your-Trailhead-Playground