Installing Ruby applications

I’ve been trying to figure out how to install either Trivium or Scanty, however, the former has no instructions, while the latter does, but I get stuck on “visit: localhost:4567”. Can anyone explain to me how to install either of this? I’ve enabled Ruby on a subdomain, I’ve downloaded and logged in using an SSH client, and I’ve set up a demo using the tutorial on Ruby Dreams, but that’s pretty much all I’m able to accomplish, aside from installing Sinatra (I believe I did, anyway, I typed “$ gem install sinatra”, and don’t recall getting any errors).

Can anyone explain how I’m supposed to go about installing one of these on my site?