Lenovo 80N50004FR User Manual page 22

 Connecting network cables
To insert a network cable, do the following:
1
Hold one connector of the network cable to press the RJ-45 cover down gently
2
Insert the connector into the RJ-45 port
Software configuration
Consult your Internet Service Provider (ISP) for details on how to configure your computer.
Chapter 1. Getting to know your computer
b
.
1
2
15
a
.