There are many ways of connecting. The first step is to use a IRC client that you prefer.
A popular client on Windows is mIRC. Once installed you can select the server you would like to use:
From there add the server using the 'add' button:
In the server settings the description can be anything; but for the address use 'irc.orians.org'. You can keep the port the default. You can leave the login method to none:
Hopefully all works and have lots of fun! :)