Click on Advanced to see some more advanced options for your sign-on:

If your user-id has no password you can’t just leave the password field blank; if you did AQT will assume you are doing an integrated log-on and pass neither the user-id nor password in the sign-on request. Check No Password - AQT will then sign-on specifying the user-id but not the password.
If you are having problems signing on, or if you need to enter some database-specific parameters, you should do a Prompted Sign-on. Prompted Sign-on invokes the log-on system supplied by the database vendor, giving you better control of the sign-on process.
If you need to specify additional information for a connection, check Prompt for Missing Info. You would use this if you have configured an ODBC Datasource that hasn't specified the complete information needed to connect (some people use this as a way of configuring a Generic connection).
If you are getting an error specifying your password, and you want to see what password you have really typed, check Show Password. This will show your password in clear text.
Note: this option will only be enabled once the password field is cleared (this prevents you from seeing an already-entered or saved password).
This option is only relevant when you are in Show All mode
If there are multiple saved-signon entries for that database (with different userids and passwords), AQT will use the first one it finds. If AQT finds no saved-signon entry for the database, the userid and password fields will be set to blank.
For SQL Server, Sybase Enterprise, MySQL and Informix you can specify which database you want to sign on to. By default, you sign on to the database specified in your profile.
When signing onto Oracle, you can specify that you are signing on with sysdba or sysoper privileges.
This feature is only available if you are using v9.2 or higher of the Oracle ODBC Driver. If your ODBC Driver does not support this syntax, you will get the message: invalid username/password
This specifies the number of entries AQT is to save in the Recent Database list. You can specify a value between 1 and 100.
A high value has a (slight) impact on performance as AQT saves the Recent Database list every time you sign onto a database.