Burrow is a small, mighty group and welcomes contributors and volunteers. Hyperledger chat channels are #burrow and #burrow-contributors
To participate, you'll need a Linux Foundation ID (quick work). That ID also allows you to log in here, in the Hyperledger wiki.
To access the two burrow channels, first note, if you go into a specific chat channel directly, without logging in, you will get a spinner that will not resolve.