Register on https://iknow.jp/signup to start your free trial of iKnow!. Creating an iKnow! user account is free.
If you already start studying on iKnow! mobile apps, sign up from the top green bar on the Home screen.
Once you signed up for iKnow!, you can log into the iKnow! account from both PC and mobile apps.
Note: if you have a Smart.fm account, you can log in to iKnow! with that.
Only on PC, you can use your Google or Facebook account to create an iKnow! account.