By default, Joomla will publish your items in the order that they were written: So newer items are always placed at the top of your blog layout, and are replaced with more current articles as you publish them.
To change the order of your articles, select the ITEMS icon from the K2 Dashboard menu. Your page will display a list of items on your website.
In the graphic below, you can see there are three items (Last weeks article, Yesterdays article, and Todays article). Notice the ORDER column. Here, you have two methods that can be used to change the order:
1. By clicking each of the up or down arrows, items can be positioned in a particular order.
2. The display order can also be be rearranged by typing in the desired order directly into the number text field.
For instanance, In my example I would like "Todays Article" to appear first, then "Yesterdays Article", followed by "Last Weeks Article". To do this, I am going to simply re-order the items by typing what order I would like them to appear into the numbered text field.
Once you have finished, make sure you save the order by clicking the graphic of a diskette found at the top of the order column.