Add a Benchmark Email signup form to your sidebar. You can also manage lists, and edit and email your blogs to subscribers.
Install like any wordpress plugin.
Upload benchmarkemail to the WordPress plugins '/wp-content/plugins/' folder
Activate the Plugin from the admin panel using the 'Appearance > Widgets' menu in WordPress
Goto BenchmarkEmail and get your API token from your "My Account Settings" in the "My Home" tab.
Insert the API Token into the BenchmarkEmail Token box in WordPress. Click Update. If the token is valid, it should automatically populate your dropdown lists for importing/exporting from your BenchmarkEmail account.
To add the signup form on your pages, go to the Widgets Appearance page and click Add against the "BenchmarkEmail Subscribe" widget. You can configure the title and success message for the widget. The contacts are added to your WordPress account, from where you can export them into any of your BenchmarkEmail contact list.