The game has been updated for how to sell medal to war fund, but don't worry, i also update my guide.
Ok lets go to the guide..!!!
Selling medal to war fund can only be done if there is a selling medal session. The selling medal session is time to queue up our medals to sell to war fund. The time is random, but usually between minutes XX:27-XX:30 and XX:57-XX:30. So keep refresh the war fund page at that time.
To find out when selling medal session time, there is an indicator there is an indicator (red dot) at the right of the euro or gold amount (look picture below).
If you see the red dot like on the picture above, it mean is time selling medal session, so you can queue your medal to sell to war fund. But keep in mind, every player who has queued up his medal for sale is not 100% successful sold.
To sell medal is same like before, go to My Medal and select the medal that you want to queue, input the captcha and click the Sell Medal button. (captcha only comes out if there is a selling medal session).
Video Tutorial
