I need to add a "Popular Last 30 days" widget

Hi,

This is hard to do, you can look on how the “last 7 days” sort option is made, modify or duplicate it, make tests to see if it works properly and add the option o the blocks sort order section. If you don’t know how to doit you may have to hire a professional coder, you can find one on sites like http://studio.envato.com/ . Sorry for this.

You can also look for a plugin like – http://wordpress.org/plugins/wordpress-popular-posts/
Note that i didn’t make any tests with this plugin, it’s just an example.

Thank you, Emil G.