Plumis, it is not possible to edit/rename the default fields of the new entry form. You can do the following:
1. Hide the fields you don't need via CSS, e.g. to hide the field "Manufacturer", add the following line to the CSS file:
You can find the classes of the fields with the help of the Inspect Element option of your browser.
2. Enable additional fields in Control Panel -> E-shop -> Module settings -> Enable the following number of additional fields for items. Then you can rename the enabled fields in Control Panel -> Settings -> Replacement of default phrases -> ADDITIONAL FIELDS FOR E-SHOP ITEMS.
I'm not active on the forum anymore. Please contact other forum staff.