In order to bulk modify your articles, please go to "My articles", select the desired ones with the filter and then click on the "Bulk Edit Mode" link in the top-right corner of your article list. You can then edit all your aticles at once.
You can also do mass modifications. To do this, check all articles that you want to modifiy and use the bulk modification form on top of the table and confirm with [OK]. Please make sure to check the information about how to mass modify prices by moving the mouse to the blue information icon next to the price field.
Once you have finished modifying, commit your changes by clicking on the [OK] button in the blue title bar of the article list.
We sincerly hope that this makes life easier for you!