In the next screen, click on 'New Ticket Type' and enter your ticket name (ie group of 5, table of 4, couples admission, family admission).
For the face value of the ticket, enter the price of what each individual ticket would cost.
The default for the Multi-ticket Package Quantity is set to a standard single ticket. When you change to greater than a single ticket, tickets will only be able to be purchased in multiples of that value. For instance, if you set up a group of 3, customers would only be able to choose tickets in values of 3, 6, 9, 12, etc.
If you're setting up a group of at least a certain number of tickets, the better option would be to use the Minimum Purchase Quantity. For instance, if it is a group of 6+, you can set the minimum to 6 and not use the multi-ticket package.