Before TT4 there was a menu pick for changing User Name and Password. Now, in TT4 it is Preferences. But in Preferences, only the User Name can be changed. How does an individual user change their password?
As a side note, there is inconsistent use of terms. On the log-in screen it is called “User Name” but in Preferences it is labeld “Login”. Suggest that you decide on a term and use it consistently throughout the app.