We provide free instruction how to configure Tumblr Consumer Key and Tumblr Secret Key?
1. Go to Tumblr Developers link and login with your credentials.
Click on the "+ Register Appliaction" button.
2. Enter your Application name in "Application name" field.
Fill Application website: http://www.yoursite.com/
Enter your Application description in "Application description" field.
Fill Default callback URL: http://www.yoursite.com/module/MODULENAME/tumblr
"MODULENAME" - folder name with the module
Click "Save changes" button
3. Copy the generated "Consumer Key"and "Secret Key"