How to leave a message as anonymous

Hello,

I’m (manually) importing messages from my previous blogware (Dotclear 2) and I am faced with a limitation: there, anonymous commenters could easily write any name they wanted, but in Drupal, it is not possible. Since, by definition (Dotclear doesn’t have any account function) no one is registered, which option shall I turn on to allow names for visitors?

Please don’t hesitate to forward me to an already existing topic (I could not find any).

Thank you.