The Redirection plugin will help set 301 redirects and for you to monitor 404 errors that happen on your site. This is very good for blogs that have been migrated and have some links that might hurt their SEO.
Basic Blogs are pre-loaded with this plugin. Just click to activate the plugin.
For the Advanced Blog plan, you'll want to look up "Redirection", Install and Activate.
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Once active, the plugin will show up in your Tools>>Redirection. You can then set the URLs you'd like to have redirected. Click to START SETUP and Redirection will take of the rest.