When you have selected a group in the address book, click the SAVE button (see figure 1). However, you need to edit the group to be able to send the job.
Figure 1: Save selected contacts from a group
Thus, click the edit icon
in the iteration to display the members of the group and make your selection (see figure 2). Please note that the number of group members can be very high.
Figure 2: Open address book for recipient selection