Dont have the slide to add network server?

I have a dragino gateway LPS8 and to make it work i need to add another network server in the webbrowser of chirpstack. I see many people who can do that but i dont have the function to add network server? (see screenshot)

Can you help me with configuring the LPS8 gateway to chirpstack? it doesnt work! I used this Notes for ChirpStack - DRAGINO

This is how it looks when you can add network server