When you log in, you will be at the group level. Call flow settings are typically found in Services. Press Services on the left-hand side to go to the Services section. Hunt Groups are found in the Basic column.
On the Hunt Group Page, you will immediately see a list of all group-level hunt groups you have. It is highly likely you had one or more in place at the time of activation. To view and edit one of your existing Hunt Groups, press the Edit link to get more information about this group.
When editing the Hunt Group, the Addresses link lets you manage the incoming number and internal extension.