Here’s something that may save you a bit of typing, and typos, down the road: if you find you write your content and preview your post before giving it a title you may notice that the default permalink will end in the post ID.
To set this part of the permalink to the post title simply enter your title then click the Edit button beside the Permalink (found right under the Title text field). Now, empty the permalink text field that appears and click the “OK” button. You’re done!
PS: This also works if you change the title and want it to be the new pretty permalink, too.