The mailing type can be selected in this window. See Mailing definitions for more details.
One can also use an earlier made and saved mailing definition as a basis for a new mailing. This can also be selected from "Use predefined mailselection".
Furthermore the target group of the mailing can be selected. One can choose from Guests, Companies, Company contacts, Travel agents and Travel agent contacts.
After selecting the right target group, click on the arrow or use shortcut <Page Down> to proceed with Mailing wizard step 2.