Displaying Related Products in Bottom in Magento

Go to layout/catalog.xml

Comment the below code

<reference name="right">
<block type="catalog/product_list_related" name="catalog.product.related" before="-" template="catalog/product/list/related.phtml"/>
</reference>


add the below code before reference tag of above line of previous code

<block type="catalog/product_list_related" name="catalog.product.related" after="-" template="catalog/product/list/related.phtml"/>