Yes, you can completely disable the ability of your members to use the Chat, or you can disable only the All Member Chat, or you can disable Chat only for a certain Tags in Settings > Admin Settings. You will find these options if you scroll down to the Account section and Communication subsection.
Master Admins can delete any Chat.
Members can only delete their own Chat messages.
The function to delete a Chat is only available in the app version. Using the app version of BoosterHub, swipe left on the name of the Chat message you would like to delete, and select the Delete icon.
A person with a Pending Tag has not activated their BoosterHub account or downloaded the app yet, so they will not receive Announcements or Chats. However, they will receive Emails and SMS.
For this purpose, you would want to use the Announcement feature instead of Chat, so that there are no replies. The benefit of using Announcements is that it is a one-way push of information. Go to Dashboard > Announcements > New Announcements to create and send your message.
The total number of SMS texts are calculated per recipient. For example, if you have 100 members and you send two different announcements to all your members, you will be charged for 200 SMS.
If the Chat group was created using Tags, then you can assign that Tag to the individual, and it will automatically add them to the group. However, if the group was created by adding members manually, then you can not add a new member to it.