You have to use this picture:
You first have to solve the message in Japanese of last person who replied and write his name in Japanese. Then write down your message!
examplecat: meirikachishi dono(new message)
greencat: meirikachishi dono - what's up (solving message)
kunakarinnotakumikachi(the name of the last person who commented)
rinkarinrinka rinkika (new message)
Now solve my message!