BARR is traded on the NXT Asset Exchange, with the asset I.D. 7823929696462256005.

BARR coins are sent and received from your NXT wallet – if you’ve never used NXT before, just try it.  We think you’ll be impressed.

To download the NXT client, visit NXT.org.  (The installation is relatively simple, but it takes a while for the blockchain to sync)

Or to begin trading BARR instantly with a NXT passphrase, visit https://skynxt.github.io/www
To trade with NXT within the SuperNET Lite client:

You can also use an online wallet at MyNXT.info  (requires purchase of their Asset plug-in for 1000 NXT)

To burn your altcoins in exchange for BARR, visit the BitcoinTalk Announcement Topic