Many attributes of an Asset cannot be changed after the asset has been created due to their importance in financial calculations, for example purchase date. However you can amend most attributes of an existing asset.
You can amend a Fixed Assets Properties by selecting and highlighting the item from the main screen and then clicking on the Properties push-button.
Or alternatively, selecting the Properties facility from the Fixed Assets menu option.
In both cases, the Fixed Assets maintenance screen as described in Acquisitions will be displayed and you can maintain the item accordingly.