Create new distribution group under Create New Distribution Group:
1. Enter the Group Owner.
2. Enter the new Distribution Group Name.
Grant access to existing mailbox under Grant/Remove Access to Existing Distribution Group:
1. Select the distribution group from the Distribution Group Name list.
2. Select grant access from the Access Type list.
For Distribution Group Send Access,
review the
Remove Access under Grant/Remove Access to Existing Distribution Group:
1. Select the distribution group from the Distribution Group Name list.
2. Select remove access from the Access Type list.