b080 card - trading clay into stone

[Isandri]

Hi,
I would like to know, how may i use this card during the game?
I played it in my previous table, had the clay and wanted to trade it into stone to get a major improvement, but i could not trade the resources. I am an agricola newbe and would like to be at least able to play it.
B080* Hard Porcelain

[alexwjb]

Welcome to Agricola!

You make exchanges like this in the Exchange Centre. To get to it, look for the icon that looks like this:



There you will be able to convert clay to stone with Hard Porcelain (and also eat animals with a cookery, that kind of thing).