About googlebot crawler and blogspot

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Recently,i have edit my content on my blog.I have also update my sitemap to google.However,google still index my page with my old content.Only show my new content if i click the link.So if i would like them to update on my site,do i have to do anything or i should wait for googlebot to crawl my site again? I also have another question, how to i change the url of my blog post if i have edited the post.I would like it to follow my new post title in order to avoid confusing googlebot.