eBay

i am having trouble uploading a list of items keep getting the following message- but i cannot find a tag for item listing type on the csv file anybody got any ideas (am sure its me missing something)"Error - Input data for tag is invalid or missing...

we have recentlyb linked our shopify account with e bay all went well but now need to amend some listings does anybody know how to do this or does e bay link with shopify at pre determined times to carry out a sync