Step Two: Find the item you wish to edit

Use 'Find by ID' or 'Keyword Search' textbox to find the Item. (Or you can use 'filter' icon next to keyword search textbox for 'Advanced Search')

Step Three: Click the edit button

Click the 'Edit' button at the end of your item to open it's settings page.

Step Four: Make updates

In the right column, edit your item's cost in the 'Cost' textbox.

Step Five: Don't forget to save

When you are finished editing your item's cost, be sure to click the 'SAVE' button to finalize.