Check your link. It only goes to an AOL sign in page.
The picture of the wall outlet is pretty blurred. Can you take a clearer one. It looks like a coax cable wall plate. The green cable you are holding is not a coax cable or fitting. It looks like it may be an optical cord.
@EG wrote: ... It looks like it may be an optical cord.
Agree. It looks a lot like the SC connector shown on https://www.ppc-online.com/blog/fiber-connectors-whats-the-difference.
Thanks BruceW !
So @mls1492 If you are talking about hooking up a cable modem to a coax wall outlet, you'll need a coax cable jumper (whatever length you need) with F connectors such as this;