I have the basic code to the theme used here http://weconfideinwolves.tumblr.com/, however, can someone please tell me how to edit the date/headers at the top of each post? The ones on this tumblr have block colour bakgrounds and in cap locks, but mine are just plain (e.g. http://acidland.tumblr.com/). I would also greatly appreciate it if you could let me know how to make the entire posts and sidebar dead center of the page?

Or just tell me where there is a fool proof html tumblr theme bible i can study or something.
Cheers!