how to use Submenu Tree module

I am having issues displaying sibling level menu items while using the Menu Block module, I have menu block working for displaying children items but the next thing I need is to display siblings items if there are no children. I did research and found the "Submenu Tree" module, which I have installed and activated but I have no idea how to actually use it. I found this URL:

https://drupal.org/node/1299560

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Modules

Documentation to come. Under development.
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Getting Started: Recommended Modules

The following modules are recommended

Panels, Panels Everywhere and Panelizer
For configuring your display and also activating alternative layouts for sub-sections of your website; Panelizer provides additional functionality (per-object display changes, multiple selectable displays, etc) for entities.

Basic Drupal 7 website step-by-step: WYSIWYG, News, Menu and Slideshow

So here we go. We are new to Drupal and we want to build our first very simple website. In this tutorial, we assume that you already have Drupal core installed and a basic installation running. You know how to install new modules. We also won't look at how one can theme his website.

Admin menu

First of all, for gain of time during all the project, install the admin menu module. Disable the core Toolbar module. You have now a new drop-down administration menu at the top of your site.
Note that this step is not strictly necessary but just make things easier. Most of the people use this admin menu instead of the normal one.

WYSIWYG

Drupal 7 top ten contributed modules

You can find a list of the top 10 modules using the Project usage overview.

It's helpful to be familiar with the top 10-20 modules on this list as they will solve many of the most frequent needs that you will run into as a site builder.

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