If you are unsure, leave it unchecked and click “continue.” It is not recommended for users who commonly use public wireless networks or a modem. Bonjour allows you to exchange messages and files with computers that are nearby and/or on your network. The next screen asks if you would like to use Bonjour Messaging.If you have a Jabber Account, you can set it up on the next screen. Otherwise, just ignore it.Start iChat by clicking on its icon on your dock. You will be asked to enter an AIM screen name (see above) or a .Mac member name. Click Continue.To sign up for an AIM account, visit and click “Get a Screen Name.” After you register, AIM will send you a confirmation email and you can use your screen name to sign into iChat. If you don’t have either, AIM is a common used platform and completely free. When you first open iChat on your Mac, it will give you the option of using a .mac or Aim account. How to Setup your iChat Account There are several ways to set up and use an iChat account. You can talk to anyone with Internet access and a .Mac, AIM, Google Talk, or Jabber account. IChat is a Macs‐only platform that allows you to talk via text chats, voice chats, or video chats with one other person or a group of people.