[header] How to add a twitter tab on tumblr [title] Sign in to both your tumblr and twitter accounts in separate tabs. [title] Go to the " tweet button " code site at twitter.com. [step] You can do this by clicking resources] buttons on the twitter homepage or simply by clicking. 
[title] Choose which twitter button you want on your tumblr page. [step] You can choose from 4 different options.