Slack to private channels
Out-of-the-box Everhour can post timesheets only to public channels. In order to select private channel, Everhour should be added (and thus authorized) to the channel inside Slack first.
- Open private channel in Slack
- Click "info" icon, then click "..." menu item and select "Add apps"

- Find Everhour and click "Add" button

- Go back to Everhour website and refresh channels list
