If you are an administrator of a slack team, then you have the option to simply connecting your slack team with Baloonr. We take care of registering your team alongwith all slack users who are part of the team to Baloonr. We also provide a bot (called @baloonrbot) who can help all your team members on slack to launch baloonrs from slack directly. The bot also posts notifications to any channels that it's a part of, as well as direct messages to individuals as necessary.
To register, simply click on the 'Add to Slack' button that you can find at http://baloonr.com and follow the instructions.