This LoginPress add-on is a widget you can use into your blog sidebar. It uses an Ajax way to login via the sidebar. You may need to know HTML/CSS to give it style according to your site even we have styled it in general.
Download LoginPress – Login Widget 1.1.0 at WP Liga for Free with an active Membership. You will receive the exact same .zip file distributed by the original author, secure and 100% virus free.