If you want to report bugs for the Renga #xmpp client, you can now log in to the bugtracker using your Jabber address. No need to create an account anymore!
If you want to see how it's done, see https://pulkomandy.tk/gerrit/plugins/gitiles/xmpp-fcgi-authorizer/
If you want to try it, go to https://pulkomandy.tk/projects/renga (and please do not create fake bug reports)