Here this gives you the code, and where to put it: http://tumblring.net/making-your-tumblr-...
I just fixed my problem, I had recently just installed a new theme as well as a music player the latter being the one I thought was the problem. Neither one was the problem, I went to my dashboard and clicked on my preferences and changed the endless scrolling, go to your blog, you should be checking for endless scrolling without repeating images.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.