Why can’t members of the group find the group?
You cannot manually search for a group. Those that you have invited will be automatically added into the group. If someone that you have invited to a group doesn’t find it, a possibility is that he or she has registered with Spond using a different phone number or e-mail address than what you invited them with.
Ask the person what contact details he or she is registered with, and make sure that you have added the right details.