Board Game Arena

One of the 'Bonus Actions' is Complete One Contract: "Return all necessary goods to the supply, receive the rewards for the contract, and add the completed contract to your drawer"
I'm not sure I can see how you do this. I've tried clicking on the contract itself, and clicking on the resources I need to return to the supply, but neither worked for me.

If you got the matching ressources the contract will gain a highlighted blue rectangular around it.

If you can't klick it you simply don't have the matching ressources.