Click the zoom arrow next to the item whose information you want to change. The Item Information window appears.
Make the changes you want in each of the views of the Item Information window.
Note: Some things might be unchangeable
Depending upon what you’ve done with a particular item, you might not be able to change some of its basic information. For example, if you’ve recorded sales or purchases with an item, you won’t be able to unmark the I Buy This Item, I Sell This Item or I Inventory This Item selections. If you want to change these selections, you’ll first need to remove the transactions that the item is assigned to.