Create new Tumblr application
Create new tumblr application to get start with tumblr login. Follow these step
Note: Make sure you have already a tumblr account.
Step 1: Go to https://www.tumblr.com/oauth/apps
Step 2: Click + Register application
Step 3: Enter apps settings, click Register
Step 4: Get OAuth consumer key and secret key
Read next tutorial to start using tumblr login