Here's how to view or change your registered email address.
From the web:
- Click "Settings" under the account menu at the top of the dashboard (looks like a person's silhouette).
- To the right of your email address, click the pencil icon.
- Update the email address and confirm your password.
- Save your changes.
In the apps:
- Go to the account tab by tapping the person silhouette.
- Tap the gear icon.
- Tap "Global settings."
- The email address is right near the Log Out button.
Note that you can't change your email address from the app at this time, but you can do so from your computer or from a mobile browser.
Also note that if you previously signed up through Yahoo and are now seeing a Tumblr login screen when you go to enter the site, your regular login will still work fine there.