i cannot change contracts of players

I bought Ramos of the transerlist for 69 tokens, and i cannot use him in my team.
The green button have no text and touched the red button, and without any confirmation, he's removed.... away 69 tokens.

I'm playing the Dutch version, maybe a translation bug, that you've forgot the add text for the green button.
i've search on Google, and read something about a dropdown etc,but i don't have a dropdown..


I hope i can get Ramos back, i'm using the same FB account as here.