The fastest way to actually try Rymnet is in your browser, right now — nothing to install.
https://console.rymtech.net/ is a live, full rymsh session running in your browser tab. It talks to the real Rymnet peer network through that server, the same commands documented on the rymsh page — a sandboxed virtual computer, the lynx-style browser for .rym sites, search, and (if you log in) accounts and mail.
Try it
help see what's available lynx rymnet-overview.rym search rust login <username> <password> create or restore an account
Worth knowing before you log in
The console is convenient, not the most private way in. Logging in through it sends your password to that server — the same tradeoff logging into webmail makes. It derives your keys in that server's memory for the life of your browser session only, never writes your password or keys to disk, and drops them on logout or idle timeout — but for that session, whoever runs this particular console is in a position to see what you type. If that's not a tradeoff you want to make, install rymsh natively instead (see Getting Started): the same experience, except your password never leaves your own machine.