Power Query transform help

So, thanks to tips from great people here I've began to use power query, and it's simply amazing :D :D

Now,there's a transform issue I'm having trouble with - see excel help file attached.

The issue is the following:

-Every row must have date, seller, product and currency.
-The data currently has date and seller in the first two columns, but the product and currency in the first two rows.

Any ideas?

Thank you. Never occurred to me to merge the columns first. Now I feel silly! :D

Cheers!