How to change Lucky Rascal Coin to Box??

How to change Lucky Rascal Coin to Lucky Rascal Coin Box??

Please be informed that Lucky Rascal Coin is used through fishing to acquire Lucky Rascal Coin Box.
This box can be opened to get one out of several rewards according to the current contents.

For more details regarding the contents please check:
http://forum.playrohan.com/forum/sho...#axzz7q0ViS1h2

Thanks for the support!