M2000 MiFi vs ethernet router

Excellent idea, thank you for laying that out for me. I made those changes in the C1000A admin page, saved the changes, and found they did not take. I tried several times. Very frustrating. Then I made the mistake of turning off DHCP (thinking that I needed to make the IP changes between DHCP off/on. Yikes! Thereafter, I couldn't get into the admin page to re-enable DHCP, stuck with no internet access. 

Eventually, the router was reset to factory defaults (and DHCP is on by default).

After much trial and many errors, I found on my Windows 10 PC that I needed to delete the Network Bridge (thereby isolating my PC from the router providing its own DHCP). Then I could browse to 192.168.1.1 and log in to the admin page. If I then recreated the Network Bridge, the admin page immediately told me that I had lost internet connection -- not "accurate" because I could browse the internet via MiFi with/without the Bridge. The Bridge is only needed so we can see the ethernet network in the office, particularly the printer. 

Anyway, deleting/creating the Network Bridge is an acceptable level of inconvenience for accessing the admin page.

Thanks for your help.