Just link your twitter account with your blog and it should show up.
Do you have javascript turned off on your browser? It won’t work without javascript.
The css is in an external stylesheet, which I don’t think you can change. You’ll have to write some custom css in the custom css section. Since it’s at the end, it will override the defaults.
You’ll have to write some custom CSS. background:url(“url” repeat-y);
You don’t need any css knowledge. Tumblr has an option to allow people to ask you questions. Turn that on. Then turn on Allow ask question section from theme options

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I'm just some another guy who's life has been taken over by tech, web development and design. Here I share about experiences and interesting observations I make in my daily mission to learn more...