Power of attonery

My husband is the owner of his flat. However, he is visually impaired and although he is a member, he does not participate in the activities of the Society. Since the Society needs help, can I get a Power of Attorney from him and then help in thebsociwties affairs? I will be working on his behalf. As even though you Do good work fornthe society the other members tell me that I am not a member and hence can't help. How can I make their mouth shut. Thanks