Can anybody help me with my blogskin?

first of all, my blogskin is shifted to the left of my screen, i was wondering what i had to add in to shift it to the middle because its really inconvenient that its too the right. furthermore, i don't know how to click next post or older posts, because there isn't a link. if anyone can help me can you please contact me or leave a response. help would be GREATLY appreciated. (: