I had a hard time searching on how to customized my secondary blog since tumblr’s UI has changed again. Ang dali lang pala ! Epal. XD Just click on the gear icon which is the settings, choose the name of your blog on the left side, and you’ll see at the bottom after the URL, the THEME, just click “Customize”. And, That’s it !
THANNK YOU SOOO MUCH!