We are now in the position where we can disconnect the Raspberry Pi completely from our keyboard, mouse and display, connect the Raspberry Pi straight to the router and work using a network connection with the IP address of the Raspberry Pi.
If you are using a Mac computer you can do:
using your Raspberry Pi username and IP address.
If you are using a Windows computer you will require an SSH client. puTTY is a free application which can be used for this and is described at:
Download and install puTTY and connect to the Raspberry Pi with the username and IP address.