To create new item, click on Master Menu - > Items->Actions->New Item.
This form will appearing,fill the details and save it.
For adding price details, click on Price tab ->Add New.
For adding partner details, click on Partner tab ->Add New.
To see the listing of items, click on Master Menu - > Items.
You can edit Item by right click on Items -> Edit Item.
Please check your uploaded file extension.
Please Select a file.