Change Tumblr Password
Log in with your email account and existing password.
Then click the cog setting and you will see the option to change your password.
How to reset Tumblr password if you have lost or forgotten it
As with Twitter, you need to enter your existing password as well as the new version and its verification. So, if you have set up your account to log in automatically, you may be in difficulty.
But, Tumblr have you covered.
Type https://www.tumblr.com/forgot_password into your search bar and it will take you to a place where you can ask Tumblr to send a link to your email account with the option to reset.
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