Board Game Arena

I played my second game, wanted to buy a card, and i was asked to choose the coins i wanted to pay.. i did not understand how to do this ans was kicked out (ty opponent). 8 had a gold coin, i am guessing that was why i was asked, vut how do i choose the coins and proceed?

Click on your coins when asked to select them.

Thanks.. no idea what was wring the first time. It worked ok the second time.