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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