Just go into the dashboard of your blog here on WordPress and click the My Blogs link on the left. Then, find the blog you want to enable the post by email feature on, and generate a special email address for it. Once you’ve got that special email address, you can post to your blog from any email client. Just type your email as you normally would. The subject line of the email will be the title of your post. You can post graphics, images, links, and videos too. And, if you’ve got email capabilities on your cell phone, you can even post while you’re on the go.
You should receive a confirmation email from WordPress once your email has posted to your blog.
Set up your blog to post by email and give it a try!