While TripSit scrambles IP's and hostmasks by default, some users want another layer of protection. For this reason TripSit provides a Tor hidden service to allow anonymous connections. You will need to connect without Tor at least once to register your nickname.
Connect without tor and register a nickname with NickServ (More information can be found on the How To Register your Nickname page.)
Configure your IRC client to use Tor as a proxy. Directions for individual clients can be found on the Proxy Configuration for Tor page.
Start the Tor daemon (Or Vidalia control panel).
Set up your client to connect to fgkjgjce66ymgx2g.onion on port 6697; Configure your client to identify with SASL, otherwise you won't be able to connect. (A guide on how to configure SASL can be found here).
Connect! It may take some time to negotiate a connection through the Tor network, so be patient! If there's any issue, join #help or PM Physical.