Cannot access my Pepwave AP one AC mini

Hi, I need help with my Pepwave AP one AC mini.
I do not know the shared key to connect to the AP one AC mini.
My main router is a Pepwave Max BR1 and I am running the current firmware. 7.1.1. I access the router by using 192.168.50.1 and I know what the shared key is.
My AP one AC mini is connected with an Ethernet cable but I have no idea what the shared key is so I cannot connect to it- can anybody help?
I also want to change the SSID, I assume if I am assisted in changing the shared key the SSID will then be fairly easy…
Thanks in advance

Ok I managed to find the shared key through my PC.
My next question is what I touched on in the original post- how do I access the AP one AC mini and change the SSID?