I'm obviously missing something here. I have legendary mantis blades. I went to the Ripperdoc and got them installed. I added two epic mods to them. Okay, great! Now how do I access them as in "use" them? I went to 'inventory' and tried to swap out one of my three chosen weapons... not there. I see them in 'cyberware' but I cannot see any way to get to them. What am I missing?

Blades, Nanowire and (I think, but have not used them) Gorilla arms all become a 4th weapon when you have those installed.

The 4th option (my favorite) is the projectile launcher and it doesn't become a 4th weapon but replaces grenades instead.

Thanks for that ... Sorry, another dumb question... What do I do if I find myself just wanting my fists... The bare knuckles matches or if it comes to it, a need to punch someone? I can't install and uninstall the blades, right?

Just press the "fists" button again or pick the "fists" on the weapon selector. And for the arm canon - just scroll to the next grenade.

Open up your key bindings in game and set them to one of the 4 key slots ready for weapons. As others say, they are considered fists. I think they default to slot 4

Tapping that key in game readies the weapon/fists. Hitting another of the 4, readies that weapon