To start IMing from Franz all you have to do is identify yourself with your user account. For Telegram just add your phone number, for Facebook enter your username and password, and for WhatsApp use a QR code.
Franz's interface makes managing several accounts super smooth, with each account appearing in its own tab. Its notifications let you know if you have unread messages on one of your IM accounts.
Franz is a super interesting program for anybody who spends a lot of time in front of his or her Mac. With it you can reply to any message from any IM service without having to pick up your smartphone or keep several different programs open on your computer.