How to Connect to Firebird

Connecting to the database will require to enter the host, port, database user and password as explained in the Connection Dialog.

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