One of the connections on the extenders is not secure how do we add a password we need to add one

[FIORE5]

One of the connections to our extender does not have a password and we need to add one any ideas??

[plemans]

you can log into the extender and change its wifi settings. 

this guide is for the ex6100 but should be similar to your device

https://kb.netgear.com/24434/How-to-change-the-existing-wireless-settings-of-EX6100