After an incident is added, it is reviewed to ensure that it is properly categorized and prioritized.
To view incidents, navigate to Incidents in the "Filter Navigator" or more efficiently check your dashboard for open incidents to see the list of open incidents. Likewise, for Tasks you'll navigate to Tasks in the "Filter Navigator" or check your dashboard for open tasks.
EXAMPLE: Filter Navigator
After locating and opening incident or task, locate the "Assignment Group" field on the right side of the record form. There you'll be able to enter the name of the group who needs to complete the work.
After you save your changes an email will be sent to the assignee notifying them of the assignment.
For more information read the ServiceNow documentation on how to "Assign and update incidents."