Mar 29, 2019 A Jabber account can be added to Messages on your Mac by opening the Messages app, going to the Add Account page, choosing “Jabber” as the account type, and entering your account information. Messages for iOS does not currently support the addition of third party accounts. Jabber Basics: Mac If you use macOS Catalina (v. 10.15) you may have issues using the Jabber softphone. To fix this problem, Mac users can download Jabber version 12.9.1 Jabber 12.9.1 has the same features as the current Stanford version but has a slightly different look and feel.

Hello ​Chatcat49,

Links provided below are for requesting a license, installing, configuring and using Jabber. It also includes a link for troubleshooting Jabber. Jabber allows you to use your cell phone or computer to make & receive calls when you don't have access to your work phone. Its best feature (by far) is the reminder to join WebEx meetings, which doesn't require opening any programs at all. Slack or Skype will give you a superior chat experience, but Jabber is typical of Cisco products with a focus on back-end telephony.

Welcome to the Support Communities!
I understand you wish to delete the Jabber account in your Messages app on your MacBook Air.
Since this is the default account, you would need to add another third-party messaging service and be signed into it before you could disable the Jabber account. Rather than delete the account, the easiest thing to do would be to remove the checkmark from 'Enable this account.'
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Set up iMessage

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iMessage is the Apple messaging service you get automatically with your Apple ID.
If it's not already set up, you're asked to sign in when you first open the Messages app. Sign in with same Apple ID that you use with Messages on your iPhone and other devices. It's usually the same Apple ID that you use for iCloud, the iTunes Store, the App Store, and the account you created when you first set up your Mac.

To add a third-party messaging service, choose Add Account from the Message menu. Then choose an account provider and follow the onscreen instructions from that provider.

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To disable a messaging service or change its settings, choose Preferences from the Messages menu, then click Accounts.

Take care.