Click on the Account link in the top right hand corner of your dashboard.

Then click on theme.

Then in the top left hand corner you will see Tumblelog title.

Under that you will see the word "Untitled".

Click on the Account link in the top right hand corner of your dashboard.

Then click on theme.

Then in the top left hand corner you will see Tumblelog title.

Under that you will see the word "Untitled".