how to change the display method?

[luckypoem]

hi.
i use ur app to build a site: http://jn.luckypoem.net/ ,but how to change the display method?
i want all posts shown as:
test3
test2
test1
My First Post

i don't like the current arrangement of posts:all of them are in the same line.i want each post occupies
a seperate line.