How to Connect to Firebird

The Connection Dialog and the fields available there ( host, port, user, database, SSH ) are explained in the Connection dialog page.

Connect from DbSchema using the default user SYSDBA with password masterkey, and the 'C:\dbtest.dbf' in the Database field.
Connect to Firebird

Tip Firewalls & anti-viruses may block database connections. Read How to enable Firewall connections.

Guided Installation Tutorial

Download Firebird Sql from: http://www.firebirdsql.org/en/downloads/

Select the components

Create or don't create start-up folders....Select Additional tasks:

You may manage also the way Firebird is running using a tool you can download afterwards from 'http://www.firebirdsql.org/manual/qsg15-installing.html'.

Before connecting to Firebird create a database in Firebird by launching ISQL and execute
create database 'c:/dbtest.dbf' user 'SYSDBA' password 'masterkey';
commit;
Create Firebird database

Fix Encryption Errors in Jaybird 3

As to the "Incompatible wire encryption levels" error, Firebird 3 by default requires wire protocol encryption, which Jaybird 3 doesn't support (it will be available in Jaybird 4). You need to configure Firebird (in firebird.conf) by setting WireCrypt to Enabled as documented: 
    - https://www.firebirdsql.org/file/documentation/drivers_documentation/java/3.0.2/release_notes.html#notes-on-firebird-3-support
    - https://github.com/FirebirdSQL/jaybird/wiki/Jaybird-and-Firebird-3