every task has a menu at the top right to corner. One of the options there is to delete the task. If you cannot see such a menu, it might has to do with your theme or your installed plugins.
You can either give us access to the page with the problem so that we can check the cause or to send us information about the theme and the plugins you have installed so that we try to reproduce it.
and thanks for your constructive feedback. We just uploaded a new version (1.1.0) which is BuddyBoss compatible. Please check and let us know if everything works fine now.