You do not have a contract of employment as a volunteer, so you do not have the same rights as an employee or worker. You will usually be given a volunteer agreement that explains: the level of supervision and support you'll get. what training you'll get.
Asking a volunteer to leave should always be a last resort when other ways to solve a problem haven't worked. See our guidance on solving volunteer problems. In rare cases, it's a necessary response to a serious breach of conduct.