As per your post, Your menu link for now is : http://www.smarti.com.sa/index.php?option=com_content&view=article&id=6 .
But, you want to use this like : http://www.smarti.com.sa/index.php/your_menu_name.
You can use aliases of menu links.
You can find aliases here, When you create/edit a menu link from backend of joomla you can see an alias associated with it. You can also find Aliases of menu link from grid screen of you menu type.
For showing Menu in front end you have to create CUSTOM HTML module, You can find how to create Custom HTML module here : http://vinaora.com/2012/09/how-to-add-custom-html-to-your-joomla-site-2/
Now, How can you find HTML to write in thst Custom HTML Module? So, for this you can go the page of front-end where that menu is visible. Now prss CTRL+U, you will see the HTML of that page. Here, you have to find the HTML of those menus.
In this HTML, you will find the links like : index.php?option=com_content&view=article&id=6
Now, you have to replace these links with index.php/alias_of_your_menu.
Now paste the edited HTML in Custom HTML module and save it by selecting a proper Position.