You need one Cat5 network cable. Connect this between the Ui24R Ethernet socket ( not Ethernet 2) and your computer.
On your computer, normally the network adapter is given its own IP address by the DHCP function on the router. With a peer-to-peer connection, there is no router involved so you need to give your computer an IP address manually.
This is the default setting on the Ui24R. Note the IP address 10.10.2.1.
Your network adapter is to be set like this. Note the IP Address 10.10.2.5 and the blank default gateway.
In your browser, go to http://10.10.2.1 … and the mixer software should load.