If you have commit writes to the trunk on launchpad this is how you go about actually commiting.
- First tell bzr your launchpad username
bzr launchpad-login username
- Check out the branch
bzr co lp:zookeepr zookeepr.trunk
- You should keep this copy pristine and work in a branch
bzr branch zookeepr.trunk bugfixes
- Merge your changes back in
cd zookeepr.trunk bzr merge ../bugfixes
- Commit the changes to launchpad
bzr commit -m "foo bar"