Typeface problem with keyboard (Hiragana / French alphabet)

Hi,

I have two problems with my learning Japanese (I am French) on Memrise:
Do you know how to type the little つ so that the answers are counted as correct, as in まちがつています ?

And for some basic words like “konnichiwa” or “gomennasai”, I can’t know whether to write them in hiragana or latin alphabet; the exercise says " Type the Japonais for the French above and press Enter ", but sometimes, in fact, I have to type in French ! :