Add Static ARP Entry to Verizon AC1750 Router

As documented in this question, I need to make a static ARP entry on my router. My router is a Verizon AC1750, and I am facing some difficulty along the way. From what I can gather from the router's user interface, I cannot add a static ARP entry from it, however I have read that it is possible to add such an entry by using telnet to log in to the router.

This article contains the following screenshot showing that telnet can be enabled on a Verizon router.

Seeing this, I decided to log in to my router and enable the option, but when I got to the "Local Administration" page on my router, this is what I saw.

I have no problem with using SSH instead of Telnet, especially since SSH is certainly more secure, but SSH does not seem to be working properly. When I log in to my router via SSH, here is what I see.

I have limited experience with SSH, although I have used it a little bit. When this terminal was presented to me, I did what I usually do when I see a console and don't know what to do. I typed help, which retued a very unhelpful error: -sh: help: not found.

I am now lost and have no idea where to go from here.

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