Due to some specifics of the user inferface in the latest versions of Windows, you may not see the password field (see Picture 1).

As a workaround, we would like to suggest you to perform the following steps:

1. Run AnyLexic 2.0 Server Administrator.
2. Switch to the Database tab and click the "Switch Offline" button.
3. Switch to the "Users and Access".
4. Select "Admin" and click the Edit button.
5. In the appeared window press the TAB key 3 times. After this step your cursor will be placed into the password field (invisible).
6. Enter your new password carefully and click the OK button.

Picture 1 - the problem.