Setting to No Post

From PluginWiki

As well as the standard changes to moderation status (see Status), the plugin can allow you to set members to No Post in a single click. You should consider carefully whether to do this - normally putting members on moderation is sufficient.

You configure this on via Features->Advanced Options:

You'll then see a link under the member's name:

If you click on this, you'll see the usual Working...' followed by Changed (or, if it doesn't work, Failed).