When TAD starts the very first time; it would detect that your credentials have not yet been verified. You would be asked to provide credentials to verify that you are indeed a registered user. Without a registration, you will not have the credentials to use TAD. Please ensure that you do a proper Registration first! Also, do not skip the verification email sent to your email address. Your email MUST be confirmed in order to use TAD.

Once you have registered, this is what you should do when you start TAD:

If you are registered at our own hosted Mattermost Chat server
Provide the email address and the password that you used at our own hosted Mattermost chat server

The following is not yet active. Testing is going on
If you are registered at the externally hosted Zulip system for TAD
Provide the email address you used at Zulip. And , MOST importantly, in the field which asks for the password, provide the API Key that for your Zulip account. Do NOT give the password you used at Zulip. The API Key is available from your account settings at Zulip.

Note
The same process of verifying your credentials would happen once every few weeks (approx once a month)