If the instant messaging account that you want to use is not enabled in the drop-down account list when you try to start a new conversation or join a room, your account details may not be correct.
Make sure that you are connected to the Internet, or to a local area network.
Choose Edit ▸ Accounts and select the account that is not working.
Type your username and password again to make sure that they are correct.
Check in the Advanced section that all the details are correct. You should be able to find these details from the website of the messaging service.
Check that the account is switched on.
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